Prof. Wolfgang A. Ertmer Profile

Prof. Wolfgang A. Ertmer

Professor at Leibniz Univ Hannover

SPIE Involvement:

Author

Publications (64)

Proceedings Article | 22 February 2018 Presentation + Paper

Creating the first Bose-Einstein condensate in space

M. Lachmann, H. Ahlers, D. Becker, S. Seidel, T. Wendrich, E. Rasel, W. Ertmer

Proceedings Volume 10549, 1054909 (2018) https://doi.org/10.1117/12.2289686

KEYWORDS: Interferometry, Rockets, Interferometers, Physics, Semiconductor lasers, Laser stabilization, Rubidium

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Proceedings Article | 16 February 2018 Paper

FPGA based laser frequency stabilization using FM spectroscopy

Christian Spindeldreier, Wolfgang Bartosch, Thijs Wendrich, Ernst Rasel, Wolfgang Ertmer, Holger Blume

Proceedings Volume 10518, 1051813 (2018) https://doi.org/10.1117/12.2288370

KEYWORDS: Laser stabilization, Field programmable gate arrays, Spectroscopy, Semiconductor lasers, Modulation, System on a chip, Rubidium, Photodiodes, Signal processing, Beam splitters, Frequency modulation, Digital signal processing

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Proceedings Article | 5 January 2018 Open Access

The space-time explorer and quantum test of the equivalence principle mission (STE-QUEST)

Naceur Gaaloul, W. Ertmer, E. Rasel, Claus Braxmaier, Arnaud Landragin, Philippe Bouyer, Kai Bongs, Guglielmo Tino

Proceedings Volume 10564, 105641L (2018) https://doi.org/10.1117/12.2309242

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Proceedings Article | 20 February 2017 Presentation + Paper

0.75 atoms improve the clock signal of 10,000 atoms

I. Kruse, K. Lange, J. Peise, B. Lücke, L. Pezzè, J. Arlt, W. Ertmer, C. Lisdat, L. Santos, A. Smerzi, C. Klempt

Proceedings Volume 10119, 101190D (2017) https://doi.org/10.1117/12.2250786

KEYWORDS: Chemical species, Clocks, Interferometers, Atomic clocks, Microwave radiation, Phase shifts, Interferometry, Optical spheres, Oscillators, Particles

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Proceedings Article | 29 April 2016 Presentation + Paper

Development of a strontium optical lattice clock for the SOC mission on the ISS

S. Origlia, S. Schiller, M. Pramod, L. Smith, Y. Singh, W. He, S. Viswam, D. Świerad, J. Hughes, K. Bongs, U. Sterr, Ch. Lisdat, S. Vogt, S. Bize, J. Lodewyck, R. Le Targat, D. Holleville, B. Venon, P. Gill, G. Barwood, I. Hill, Y. Ovchinnikov, A. Kulosa, W. Ertmer, E.-M. Rasel, J. Stuhler, W. Kaenders

Proceedings Volume 9900, 990003 (2016) https://doi.org/10.1117/12.2229473

KEYWORDS: Strontium, Clocks, Optical clocks, Laser stabilization, Optical lattice clocks, System on a chip, Atomic clocks, Geodesy, Laser spectroscopy, Chemical species, Semiconductor lasers, Laser systems engineering

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Proceedings Article | 4 March 2016 Paper

Satisfying the Einstein-Podolsky-Rosen criterion with massive particles

J. Peise, I. Kruse, K. Lange, B. Lücke, L. Pezzè, J. Arlt, W. Ertmer, K. Hammerer, L. Santos, A. Smerzi, C. Klempt

Proceedings Volume 9764, 976408 (2016) https://doi.org/10.1117/12.2209557

KEYWORDS: Quantum information, Particles, Chemical species, Quantum mechanics, Entangled states, Photons, Tomography, Metrology, Oscillators, Spin dynamics, Homodyne detection, Error analysis, Electroluminescent displays

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SPIE Journal Paper | 1 September 2010 Open Access

Errata: Repetition rate dependency of reactive oxygen species formation during femtosecond laser-based cell surgery

Judith Baumgart, Kai Kuetemeyer, Holger Lubatschowski, Alexander Heisterkamp, Willem Bintig, Anaclet Ngezahayo, Wolfgang Ertmer

JBO, Vol. 15, Issue 05, 059802, (September 2010) https://doi.org/10.1117/12.10.1117/1.3497003

KEYWORDS: Oxygen, Femtosecond phenomena, Laser therapeutics, Surgery, Laser vision correction, Biophysics, Quantum optics

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Proceedings Article | 8 February 2010 Paper

Optical forces in biophotonics: transfection and cell sorting

Wolfgang Ertmer, Heiko Meyer, Raoul Lorbeer, Gerald Bergmann, Christina Krämer, Holger Lubatschowski, Hugo Murua Escoboar, Ingo Nolte, Alexander Heisterkamp

Proceedings Volume 7613, 76130Q (2010) https://doi.org/10.1117/12.841868

KEYWORDS: Microfluidics, Microscopes, Molecules, Luminescence, Biomedical optics, Ultrafast phenomena, Optical tweezers, Pulsed laser operation, Molecular lasers, Absorption

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SPIE Journal Paper | 1 September 2009 Open Access

Repetition rate dependency of reactive oxygen species formation during femtosecond laser-based cell surgery

Judith Baumgart, Kai Kuetemeyer, Willem Bintig, Anaclet Ngezahayo, Wolfgang Ertmer, Holger Lubatschowski, Alexander Heisterkamp

JBO, Vol. 14, Issue 05, 054040, (September 2009) https://doi.org/10.1117/12.10.1117/1.3253382

KEYWORDS: Luminescence, Molecules, Oxygen, Surgery, Femtosecond phenomena, Laser therapeutics, Laser irradiation, Pulsed laser operation, Laser vision correction, Multiphoton microscopy

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Proceedings Article | 26 August 2009 Paper

Telecommunication fiber link for the remote characterization of a magnesium optical frequency standard

Osama Terra, Gesine Grosche, Wolfgang Ertmer, Thorsten Feldmann, Jan Friebe, Thomas Legero, Burghard Lipphardt, Andre Pape, Katharina Predehl, Ernst Rasel, Matthias Riedmann, Uwe Sterr, Temmo Wübbena, Harald Schnatz

Proceedings Volume 7431, 74310B (2009) https://doi.org/10.1117/12.825228

KEYWORDS: Clocks, Magnesium, Laser stabilization, Fiber lasers, Calcium, Standards development, Telecommunications, Near infrared, Cesium, Optical fibers

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SPIE Journal Paper | 1 July 2009 Open Access

Green laser light activates the inner ear

G. Wenzel, S. Balster, K. Zhang, H. Lim, U. Reich, Ole Massow, Holger Lubatschowski, Wolfgang Ertmer, T. Lenarz, G. Reuter

JBO, Vol. 14, Issue 04, 044007, (July 2009) https://doi.org/10.1117/12.10.1117/1.3174389

KEYWORDS: Ear, Acoustics, Optical fibers, Sensors, Nerve, Pulsed laser operation, Electrodes, Visible radiation, Laser tissue interaction, Biomedical optics

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Proceedings Article | 23 February 2009 Paper

Stimulation of the cochlea using green laser light

G. Wenzel, S. Balster, H. Lim, K. Zhang, U. Reich, H. Lubatschowski, W. Ertmer, T. Lenarz, G. Reuter

Proceedings Volume 7161, 71611Z (2009) https://doi.org/10.1117/12.817049

KEYWORDS: Ear, Optical fibers, Sensors, Acoustics, Nerve, Pulsed laser operation, Laser tissue interaction, Fiber lasers, Thermal effects, Scanning probe lithography

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The success of conventional hearing aids and electrical cochlear implants have generally been limited to hearing in quiet situations, in part due to a lack of localized (i.e., frequency specificity) sensorineural activation and subsequent impaired speech discrimination in noise. Laser light is a source of energy that can be focused in a controlled manner and may provide more localized activation of the inner ear, the cochlea. Compound action potentials have been elicited using 2.12 µm laser pulses through activation of auditory nerve fibers (Izzo et al. 2006). Laser stimulation (813 nm) of the cochlea has shown to induce basilar membrane motion and cochlear microphonic potentials (Fridberger et al. 2006). We sought to assess if visible light (green, 532 nm, 10 ns pulses) could be used to consistently activate the cochlea. The laser parameters were selected based on our initial attempt to induce an optoacoustic effect as the energy transfer mechanism to the cochlea. Click evoked auditory brainstem responses (AABRs) were recorded preoperatively in ketamine-anesthetized guinea pigs to confirm normal hearing. The bulla and then the cochlea were exposed. Optically evoked ABRs (OABR) were recorded in response to laser stimulation with a 50 µm optical fiber (532 nm, 10 ns pulses, 500 repetitions, 10 pulses/s; Nd:YAG laser) at the round window (RW) directed towards the basilar membrane (BM). OABRs similar in morphology to acoustically evoked ABRs, except for shorter latencies, were obtained for stimulation through the RW with energy levels between 1.7-30 µJ/pulse. The OABRs increased with increasing energy level reaching a saturation level around 13-15 µJ/pulse. Furthermore the responses remained consistent across stimulation over time, including stimulation at 13 µJ/pulse for over 30 minutes, indicating minimal or no damage within the cochlea with this type of laser stimulation. Overall we have demonstrated that laser light stimulation with 532 nm has potential for a new type of auditory prosthesis that can activate the cochlea without any apparent functional damage. Further studies are needed to determine the optimal laser parameters and fiber placement locations for localized and tonotopic activation.

Proceedings Article | 20 February 2008 Paper

Investigation of reactive oxygen species formation in living cells during femtosecond laser based cell surgery

J. Baumgart, W. Bintig, A. Ngezahayo, W. Ertmer, H. Lubatschowski, A. Heisterkamp

Proceedings Volume 6854, 68540O (2008) https://doi.org/10.1117/12.763315

KEYWORDS: Luminescence, Surgery, Oxygen, Femtosecond phenomena, Laser therapeutics, Pulsed laser operation, Laser irradiation, Molecular lasers, Laser energy, Laser vision correction

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Proceedings Article | 15 February 2008 Paper

Numerical modeling of nonlinear plasma formation in high-NA micromachining of transparent materials and biological cells using ultrashort laser pulses

C. Arnold, A. Heisterkamp, W. Ertmer, H. Lubatschowski

Proceedings Volume 6881, 688104 (2008) https://doi.org/10.1117/12.761206

KEYWORDS: Plasma, Ultrafast phenomena, Plasma generation, Ionization, Electrons, Nonlinear optics, Absorption, Surgery, Soft tissue optics, Tissue optics

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Ultrashort laser pulses recently found extensive application in micro- and nanostructuring, in refractive surgery of the eye, and in biophotonics. Due to the high laser intensity required to induce optical breakdown, nonlinear plasma formation is generally accompanied by a number of undesired nonlinear side-effects such as self-focusing, filamentation and plasma-defocusing, seriously limiting achievable precision and reproducibility. To reduce pulse energy, enhance precision, and limit nonlinear side effects, applications of ultrashort pulses have recently evolved towards tight focusing using high numerical aperture microscope objectives. However, from the theoretical and numerical point of view generation of optical breakdown at high numerical aperture focusing was barely studied. To simulate the interaction of ultrashort laser pulses with transparent materials, a comprehensive numerical model taking into account nonlinear propagation, plasma generation as well as the pulse's interaction with the generated plasma is introduced. By omitting the widely used scalar and paraxial approximations a novel nonlinear propagation equation is derived, especially suited to meet the conditions of high numerical aperture focusing. The multiple rate equation (MRE) model is used to simultaneously calculate the generation of free electrons. Nonparaxial and vectorial diffraction theory provides initial conditions. The theoretical model derived is applied to numerically study the generation of optical breakdown plasmas, concentrating on parameters usually found in experimental applications of cell surgery. Water is used as a model substance for biological soft tissue and cellular constituents. For focusing conditions of numerical aperture NA < 0.9 generation of optical breakdown is shown to be strongly influenced by plasma defocusing, resulting in spatially distorted breakdown plasmas of expanded size. For focusing conditions of numerical aperture NA ≥ 0.9 on the other hand generation of optical breakdown is found to be almost unaffected by distortive side-effects, perfectly suited for material manipulation of highest precision.

Proceedings Article | 11 February 2008 Paper

Fs-lentotomy: first in vivo studies on rabbit eyes with a 100 kHz laser system

S. Schumacher, U. Oberheide, M. Fromm, W. Ertmer, G. Gerten, A. Wegener, H. Lubatschowski

Proceedings Volume 6844, 68440V (2008) https://doi.org/10.1117/12.759132

KEYWORDS: Laser cutting, Laser therapeutics, Optical coherence tomography, Laser tissue interaction, Eye, Femtosecond phenomena, Laser vision correction, Laser systems engineering, In vivo imaging, Cornea

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Proceedings Article | 13 July 2007 Paper

fs-Lentotomie: changing the accommodation amplitude of presbyopic human crystalline lenses by fs laser pulses

S. Schumacher, U. Oberheide, H. Theuer, M. Fromm, T. Ripken, G. Gerten, W. Ertmer, H. Lubatschowski

Proceedings Volume 6632, 66321G (2007) https://doi.org/10.1117/12.728197

KEYWORDS: Lenses, Laser therapeutics, Crystals, 3D modeling, Data modeling, Laser cutting, Tissues, Femtosecond phenomena, Finite element methods, Laser crystals

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Proceedings Article | 13 March 2007 Paper

Modeling of ultrashort pulse propagation and nonlinear plasma formation in transparent Kerr media using realistic initial conditions

C. Arnold, W. Ertmer, H. Lubatschowski

Proceedings Volume 6460, 646010 (2007) https://doi.org/10.1117/12.698934

KEYWORDS: Plasma, Electrons, Ionization, Ultrafast phenomena, Plasma generation, Wave propagation, Diffraction, Refractive index, Polarization, Objectives

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Ultrashort laser pulses tightly focused provide intensity sufficient to initialize nonlinear ionization processes. Thus a plasma is generated in the focal region eventually resulting in optical breakdown. The deterministic character of this nonlinear interaction enables the generation of precise and highly reproducible material alteration. To gain better spatial precision applications have recently evolved strongly towards tight focusing of ultrashort pulses using microscope objectives as focusing units. The pulse energy required to generate optical breakdown was thus reduced to nanojoules or even below. The mechanical effects subsequent to plasma generation can be minimized to the very focus. Cell surgery with ultrashort pulses enables to precisely ablate cell organelles without observable hazardous effects to the surroundings or the entire cell. To numerically investigate the nonlinear interaction of ultrashort pulses with transparent media, a model including both nonlinear pulse propagation and plasma generation is introduced. The numerical code is based on a (3+1)-dimensional nonlinear Schrödinger equation describing the pulse propagation and the interaction with the density of free electrons that are generated in the focus. The nonlinear wave equation was derived taking into account both nonparaxial and vectorial effects to accurately include tight focusing at high numerical aperture. A multi rate equation model for dielectrics recently published by B. Rethfeld is used to simultaneously calculate the generation of free electrons. Numerical calculations based on this model are used to understand the dependence between size, geometry and density of optical breakdown plasmas in various focusing geometries of high numerical aperture. The code enables to use arbitrary initial conditions for the laser field in the focus. At high numerical aperture it is most important to start the simulation using realistic initial conditions. Especially the vectorial character of the electric field is most important to be considered. Thus a vectorial diffraction integral was used to calculate initial conditions at high numerical aperture. The code is applicable to any transparent Kerr medium, whose linear and nonlinear optical parameters are known. Within this work the code was applied to water as a model substance to biological soft tissue and cellular constituents.

Proceedings Article | 5 March 2007 Paper

Fs-laser induced flexibility increase in the crystalline lens

S. Schumacher, M. Fromm, R. Lakharia, M. Schaefer, U. Oberheide, T. Ripken, P. Breitenfeld, G. Gerten, W. Ertmer, H. Lubatschowksi

Proceedings Volume 6426, 64261C (2007) https://doi.org/10.1117/12.700148

KEYWORDS: Laser therapeutics, 3D modeling, Crystals, Laser cutting, Tissues, Finite element methods, Data modeling, Optical fibers, Glasses, Laser crystals

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Proceedings Article | 9 February 2007 Paper

Developments toward atomic quantum sensors

T. van Zoest, T. Müller, T. Wendrich, M. Gilowski, E. Rasel, T. Könemann, C. Lämmerzahl, H. Dittus, A. Vogel, K. Bongs, K. Sengstock, W. Lewoczko, A. Peters, T. Steinmetz, J. Reichel, G. Nandi, W. Schleich, R. Walser, W. Ertmer

Proceedings Volume 6483, 648306 (2007) https://doi.org/10.1117/12.704287

KEYWORDS: Chemical species, Interferometers, Magnetism, Sensors, Interferometry, Semiconductor lasers, Beam splitters, Space operations, Gases, Laser stabilization

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Proceedings Article | 9 February 2007 Paper

Analysis of localization phenomena in weakly interacting disordered lattice gases

T. Schulte, S. Drenkelforth, J. Kruse, K. Sacha, J. Zakrzewski, M. Lewenstein, J. Arlt, W. Ertmer

Proceedings Volume 6483, 648308 (2007) https://doi.org/10.1117/12.704003

KEYWORDS: Chemical species, Magnetism, Superlattices, Gases, Distributed interactive simulations, Modulation, Clouds, Complex systems, Speckle, Bosons

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Proceedings Article | 6 February 2007 Paper

Live cell opto-injection by femtosecond laser pulses

J. Baumgart, W. Bintig, W. Ertmer, H. Lubatschowski, A. Heisterkamp

Proceedings Volume 6435, 643512 (2007) https://doi.org/10.1117/12.700166

KEYWORDS: Luminescence, Femtosecond phenomena, Proteins, Microscopes, Fluorescent proteins, Microscopy, Green fluorescent protein, Viruses, Cell death, Tissues

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Proceedings Article | 28 February 2006 Paper

Multiphoton microscopy for cell surgery

J. Baumgart, A. Heisterkamp, A. Ngezahayo, W. Ertmer, H. Lubatschowski

Proceedings Volume 6108, 61081B (2006) https://doi.org/10.1117/12.645699

KEYWORDS: Luminescence, Retina, Absorption, Multiphoton microscopy, Tissues, Tissue optics, Surgery, Femtosecond phenomena, Eye, Laser ablation

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Proceedings Article | 28 February 2006 Paper

Simulation of ultrashort pulse induced plasma generation and interaction within the bulk of transparent Kerr media

C. Arnold, W. Ertmer, H. Lubatschowski

Proceedings Volume 6108, 610808 (2006) https://doi.org/10.1117/12.645637

KEYWORDS: Electrons, Plasma, Ionization, Ultrafast phenomena, Plasma generation, Gaussian beams, Tissue optics, Refractive index, Pulsed laser operation, Tissues

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Proceedings Article | 18 April 2005 Paper

Investigation of retinal damage during refractive eye surgery

Silvia Schumacher, Meike Sander, Carola Döpke, Andrea Gröne, Wolfgang Ertmer, Holger Lubatschowski

Proceedings Volume 5688, (2005) https://doi.org/10.1117/12.588938

KEYWORDS: Eye, Retina, Tissues, Temperature metrology, Cornea, Surgery, Laser vision correction, Laser cutting, Laser damage threshold, Tissue optics

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Proceedings Article | 21 March 2005 Paper

Numerical calculation of nonlinear ultrashort laser pulse propagation in transparent Kerr media

Cord Arnold, Alexander Heisterkamp, Wolfgang Ertmer, Holger Lubatschowski

Proceedings Volume 5714, (2005) https://doi.org/10.1117/12.588903

KEYWORDS: Electrons, Ionization, Plasma, Tissue optics, Ultrafast phenomena, Refractive index, Absorption, Cornea, Plasma generation, Water

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Proceedings Article | 10 September 2004 Paper

Displacement measurements of technical surfaces with a synchronously pumped external cavity diode laser

Jasper Mobius, Jurgen Czarske, Karsten Moldenhauer, Wolfgang Ertmer, Thomas Muller-Wirts

Proceedings Volume 5457, (2004) https://doi.org/10.1117/12.543886

KEYWORDS: Semiconductor lasers, Sensors, Resonators, Distance measurement, Modulation, Signal attenuation, Optical resonators, Phase transfer function, Diodes, Mirrors

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Proceedings Article | 13 July 2004 Paper

Investigations for the correction of presbyopia by-fs-laser induced cuts

Tammo Ripken, Uwe Oberheide, Alexander Heisterkamp, Wolfgang Ertmer, Georg Gerten, Holger Lubatschowski

Proceedings Volume 5314, (2004) https://doi.org/10.1117/12.528955

KEYWORDS: Laser cutting, Tissues, Laser tissue interaction, Femtosecond phenomena, Eye, Cornea, Tissue optics, Glasses, Light scattering, Scanners

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Proceedings Article | 1 June 2004 Paper

Numerical calculation of nonlinear ultrashort laser pulse propagation in water

Cord Arnold, Alexander Heisterkamp, Wolfgang Ertmer, Holger Lubatschowski

Proceedings Volume 5340, (2004) https://doi.org/10.1117/12.529003

KEYWORDS: Electrons, Tissue optics, Ultrafast phenomena, Ionization, Cornea, Water, Refractive index, Diffraction, Plasma, Dispersion

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Proceedings Article | 16 October 2003 Paper

First in-vivo studies of presbyopia treatment with ultrashort laser pulses

Tammo Ripken, Alexander Heisterkamp, Uwe Oberheide, Ron Krueger, Elke Luetkefels, Wolfgang Drommer, Wolfgang Ertmer, Holger Lubatschowski

Proceedings Volume 5142, (2003) https://doi.org/10.1117/12.500421

KEYWORDS: Laser cutting, Eye, In vivo imaging, Cornea, Tissue optics, Laser tissue interaction, Femtosecond phenomena, Optical fibers, Laser therapeutics, Tissues

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Proceedings Article | 16 October 2003 Paper

Applications of ultrafast lasers in ophthalmology

Alexander Heisterkamp, Tammo Ripken, Uwe Oberheide, Omid Kermani, Thanongsak Mamom, Wolfgang Drommer, Wolfgang Ertmer, Holger Lubatschowski

Proceedings Volume 5142, (2003) https://doi.org/10.1117/12.500612

KEYWORDS: Eye, Cornea, Surgery, Laser cutting, Tissues, Laser vision correction, Laser therapeutics, Ultrafast lasers, Ophthalmology, Wound healing

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Proceedings Article | 16 October 2003 Paper

Extraluminal laser angioplasty (ELAN): laser tissue removal of arterial wall for restoration of wall flexibility and methods for therapy control

Fabian Will, Ajoy Singh, Evgeny Sharabrin, Veronika Sapozhnikova, Roman Kuranov, Wolfgang Ertmer, Holger Lubatschowski

Proceedings Volume 5142, (2003) https://doi.org/10.1117/12.500598

KEYWORDS: Arteries, Laser therapeutics, Optical coherence tomography, Tissues, Diffusion, Blood, Spectroscopy, Laser ablation, Laser tissue interaction, Light scattering

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Proceedings Article | 12 September 2003 Paper

Extraluminal laser angioplasty (ELAN): a new method for treating atherosclerotic vessels

Fabian Will, Ajoy Singh, Wolfgang Ertmer, Herbert Welling, Holger Lubatschowski

Proceedings Volume 4949, (2003) https://doi.org/10.1117/12.476269

KEYWORDS: Arteries, Tissues, Laser therapeutics, Laser cutting, Transducers, Time metrology, Surgery, Blood circulation, Optical coherence tomography, Signal detection

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Proceedings Article | 17 June 2003 Paper

3 μm diode-pumped solid state erbium laser for cataract surgery

Holger Ernst, Wolfgang Ertmer, Holger Lubatschowski

Proceedings Volume 4968, (2003) https://doi.org/10.1117/12.478260

KEYWORDS: Laser systems engineering, Semiconductor lasers, Erbium lasers, Er:YAG lasers, Surgery, Crystals, Laser crystals, Laser therapeutics, Laser development, Lenses

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SPIE Journal Paper | 1 April 2003 Open Access

Optoacoustic imaging for optimization of laser cyclophotocoagulation

Uwe Oberheide, Ingo Bruder, Herbert Welling, Wolfgang Ertmer, Holger Lubatschowski

JBO, Vol. 8, Issue 02, (April 2003) https://doi.org/10.1117/12.10.1117/1.1559998

KEYWORDS: Sensors, Tissues, Tissue optics, Signal detection, Eye, Sclera, Absorption, Laser tissue interaction, Optical properties, Ultrasonography

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Proceedings Article | 19 February 2003 Paper

Medical and biological applications for ultrafast laser pulses

Holger Lubatschowski, Alexander Heisterkamp, Fabian Will, Ajoy Singh, Jesper Serbin, Andreas Ostendorf, Omid Kermani, R. Heermann, Herbert Welling, Wolfgang Ertmer

Proceedings Volume 4830, (2003) https://doi.org/10.1117/12.486505

KEYWORDS: Laser tissue interaction, Tissues, Laser ablation, Femtosecond phenomena, Laser dentistry, Cornea, Pulsed laser operation, Laser vision correction, Surgery, Laser cutting

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Proceedings Article | 13 June 2002 Paper

Intrastromal refractive sugery with ultrashort laser pulses in living animals

Alexander Heisterkamp, Thanongsak Mamom, Omid Kermani, Wolfgang Drommer, Herbert Welling, Wolfgang Ertmer, Holger Lubatschowski

Proceedings Volume 4611, (2002) https://doi.org/10.1117/12.470587

KEYWORDS: Surgery, Eye, Cornea, Ultrafast phenomena, Pulsed laser operation, Laser therapeutics, Laser cutting, Tissues, Laser vision correction, Thermal effects

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Proceedings Article | 13 June 2002 Paper

Therapy monitoring of laser cyclophotocoagulation

Uwe Oberheide, Christoph Lee, Ronald Krebs, Herbert Welling, Wolfgang Ertmer, Holger Lubatschowski

Proceedings Volume 4611, (2002) https://doi.org/10.1117/12.470605

KEYWORDS: Laser therapeutics, Sensors, Absorption, Tissues, Optical properties, Signal processing, Semiconductor lasers, Tissue optics, Scattering, Ultrasonography

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Proceedings Article | 10 June 2002 Paper

Two-dimensional detection of optoacoustic stress transients

Uwe Oberheide, Christoph Lee, Ronald Krebs, Herbert Welling, Wolfgang Ertmer, Holger Lubatschowski

Proceedings Volume 4618, (2002) https://doi.org/10.1117/12.469853

KEYWORDS: Sensors, Metals, Biomedical optics, Tissues, Detector arrays, Ultrasonography, Aluminum, Tomography, Profiling, Tissue optics

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Proceedings Article | 1 April 2002 Paper

Ultrafast laser pulses for medical applications

Holger Lubatschowski, Alexander Heisterkamp, Fabian Will, Jesper Serbin, Thorsten Bauer, Carsten Fallnich, Herbert Welling, Wiebke Mueller, Burkard Schwab, Ajoy Singh, Wolfgang Ertmer

Proceedings Volume 4633, (2002) https://doi.org/10.1117/12.461386

KEYWORDS: Pulsed laser operation, Tissues, Laser tissue interaction, Laser ablation, Laser dentistry, Femtosecond phenomena, Cornea, Surgery, Laser cutting, Laser therapeutics

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Proceedings Article | 26 October 2001 Paper

Nonlinear effects inside corneal tissue after fs-photodisruption

Alexander Heisterkamp, Tammo Ripken, Holger Lubatschowski, Herbert Welling, Wolfgang Drommer, Elke Luetkefels, Thanongsak Mamom, Wolfgang Ertmer

Proceedings Volume 4433, (2001) https://doi.org/10.1117/12.446501

KEYWORDS: Cornea, Pulsed laser operation, Laser therapeutics, Surgery, Eye, Tissues, Laser cutting, Laser vision correction, Sensors, Optical filters

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Proceedings Article | 24 October 2001 Paper

Optoacoustic imaging for ophthalmology

Uwe Oberheide, Birte Jansen, Ingo Bruder, Holger Lubatschowski, Herbert Welling, Wolfgang Ertmer

Proceedings Volume 4434, (2001) https://doi.org/10.1117/12.446668

KEYWORDS: Absorption, Tissue optics, Eye, Signal detection, Optical properties, Ultrasonography, Biomedical optics, Sensors, Ophthalmology, Semiconductor lasers

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Proceedings Article | 15 June 2001 Paper

Optoacoustic online control for laser cyclophotocoagulation

Uwe Oberheide, Birte Jansen, Ingo Bruder, Holger Lubatschowski, Herbert Welling, Wolfgang Ertmer

Proceedings Volume 4256, (2001) https://doi.org/10.1117/12.429321

KEYWORDS: Semiconductor lasers, Sclera, Signal generators, Sensors, Eye, Photodiodes, Absorption, Optical properties, Tissues, Signal attenuation

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Proceedings Article | 7 June 2001 Paper

Optimization of the parameters for intrastromal refractive surgery with ultrashort laser pulses

Alexander Heisterkamp, Tammo Ripken, Holger Lubatschowski, Herbert Welling, Wolfgang Dommer, Elke Luetkefels, Thanongsak Mamom, Wolfgang Ertmer

Proceedings Volume 4245, (2001) https://doi.org/10.1117/12.429279

KEYWORDS: Laser vision correction, Cornea, Surgery, Pulsed laser operation, Laser cutting, Eye, Laser therapeutics, Tissue optics, Ultrafast phenomena, Laser tissue interaction

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SPIE Journal Paper | 1 April 2001 Open Access

Pulsed photothermal radiometry as a method for investigating blood vessel-like structures

Christoph Schmitz, Uwe Oberheide, Stefan Lohmann, Holger Lubatschowski, Wolfgang Ertmer

JBO, Vol. 6, Issue 02, (April 2001) https://doi.org/10.1117/12.10.1117/1.1344193

KEYWORDS: Absorption, Capillaries, Blood vessels, Radiometry, Blood, Optical properties, Temperature metrology, Tissues, Diffusion, Sensors

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Proceedings Article | 16 November 2000 Paper

Intrastromal cutting effects in rabbit cornea using femtosecond laser pulses

Alexander Heisterkamp, Tammo Ripken, Holger Lubatschowski, Herbert Welling, Elke Luetkefels, Wolfgang Drommer, Wolfgang Ertmer

Proceedings Volume 4161, (2000) https://doi.org/10.1117/12.409337

KEYWORDS: Cavitation, Tissue optics, Laser cutting, Cornea, Pulsed laser operation, Tissues, Eye, Femtosecond phenomena, Photography, Laser optics

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Proceedings Article | 16 November 2000 Paper

Optoacoustical tissue differentiation for on-line therapy control

Uwe Oberheide, Birte Jansen, Ingo Bruder, Holger Lubatschowski, Herbert Welling, Wolfgang Ertmer

Proceedings Volume 4161, (2000) https://doi.org/10.1117/12.409333

KEYWORDS: Sensors, Signal detection, Tissue optics, Reflection, Absorption, Sclera, Laser therapeutics, Tissues, Picosecond phenomena, Semiconductor lasers

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Proceedings Article | 7 June 2000 Paper

Optoacoustic tomography as a diagnostic tool for transscleral laser cyclophotocoagulation

Uwe Oberheide, Arne Buesching, Ingo Bruder, Holger Lubatschowski, Herbert Welling, Wolfgang Ertmer

Proceedings Volume 3908, (2000) https://doi.org/10.1117/12.387511

KEYWORDS: Sclera, Sensors, Tomography, Laser therapeutics, Diagnostics, Semiconductor lasers, Tissue optics, Signal attenuation, Monte Carlo methods, Picosecond phenomena

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Proceedings Article | 7 June 2000 Paper

Intrastromal refractive surgery by ultrashort laser pulses: side effects and mechanisms

Alexander Heisterkamp, Gero Maatz, Tammo Ripken, Holger Lubatschowski, Herbert Welling, Elke Luetkefels, Wolfgang Drommer, Wolfgang Ertmer

Proceedings Volume 3908, (2000) https://doi.org/10.1117/12.387518

KEYWORDS: Laser therapeutics, Cavitation, Cornea, Pulsed laser operation, Hydrogen, Surgery, Laser vision correction, Picosecond phenomena, Ultrafast phenomena, Scanning electron microscopy

Read Abstract +

Proceedings Article | 14 January 1998 Paper

Modeling and numerical simulation of the infrared photoablation process

Andreas Olmes, M. Brand, M. Raible, Holger Lubatschowski, Wolfgang Ertmer, E. Baensch, G. Dziuk

Proceedings Volume 3195, (1998) https://doi.org/10.1117/12.297904

KEYWORDS: Tissues, Laser tissue interaction, Absorption, Infrared lasers, Tissue optics, Infrared radiation, Thermal modeling, Process modeling, Temperature metrology, Natural surfaces

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Proceedings Article | 14 January 1998 Paper

Characterization of tissuelike media using the photoacoustic method

Stefan Lohmann, Michael Zacher, Christoph Schmitz, Holger Lubatschowski, Wolfgang Ertmer

Proceedings Volume 3195, (1998) https://doi.org/10.1117/12.297880

KEYWORDS: Signal detection, Transducers, Photoacoustic spectroscopy, Acoustics, Tissue optics, Optical properties, Diffraction, Pulsed laser operation, Absorption, Diffusion

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Proceedings Article | 14 January 1998 Paper

Pulsed photothermal radiometric investigations of absorbing and scattering media

Christoph Schmitz, Uwe Oberheide, Stefan Lohmann, Holger Lubatschowski, Wolfgang Ertmer

Proceedings Volume 3195, (1998) https://doi.org/10.1117/12.297882

KEYWORDS: Diffusion, Light scattering, Scattering media, Monte Carlo methods, Optical properties, Tissue optics, Detection theory, Scattering, Spectroscopy, Absorption

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Proceedings Article | 22 December 1997 Paper

Photoablation of the cornea with a Q-switched Er:YAG laser

Holger Lubatschowski, U. Hetzel, Omid Kermani, Carsten Ziolek, Wolfgang Drommer, Wolfgang Ertmer

Proceedings Volume 3192, (1997) https://doi.org/10.1117/12.297839

KEYWORDS: Cornea, Er:YAG lasers, Q switched lasers, Laser ablation, Wound healing, Pulsed laser operation, Laser therapeutics, Electron microscopy, Laser tissue interaction, Excimer lasers

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Proceedings Article | 5 December 1996 Paper

Numerical simulation of infrared photoablation

Andreas Olmes, H.-G. Franke, M. Raible, Holger Lubatschowski, Wolfgang Ertmer, E. Baensch, G. Dziuk

Proceedings Volume 2923, (1996) https://doi.org/10.1117/12.260734

KEYWORDS: Absorption, Laser ablation, Tissues, Tissue optics, Laser tissue interaction, Diffusion, Infrared radiation, Numerical simulations, Temperature metrology, Infrared photography

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Proceedings Article | 5 December 1996 Paper

Pulsed photothermal radiometric investigations of optical and thermal properties

Christoph Schmitz, Thomas Hantzko, Stefan Lohmann, Holger Lubatschowski, Wolfgang Ertmer

Proceedings Volume 2923, (1996) https://doi.org/10.1117/12.260735

KEYWORDS: Tissue optics, Thermography, Radio optics, Optical properties, Diffusion, Geometrical optics, Laser tissue interaction, Absorption, Absorbance, Radiometry

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Proceedings Article | 5 December 1996 Paper

Erbium laser photoablation of the cornea

Holger Lubatschowski, A. Hoegele, Stefan Lohmann, Andreas Olmes, Wolfgang Ertmer

Proceedings Volume 2930, (1996) https://doi.org/10.1117/12.260857

KEYWORDS: Erbium lasers, Laser ablation, Laser tissue interaction, Pulsed laser operation, Cornea, Q switched lasers, Acoustics, Er:YAG lasers, Water, Surgery

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Proceedings Article | 5 December 1996 Paper

Photoacoustic determination of optical parameters of biological tissue

Stefan Lohmann, Christine Ruff, Christoph Schmitz, Holger Lubatschowski, Wolfgang Ertmer

Proceedings Volume 2923, (1996) https://doi.org/10.1117/12.260727

KEYWORDS: Tissue optics, Photoacoustic spectroscopy, Signal detection, Acoustics, Pulsed laser operation, Transducers, Signal processing, Signal attenuation, Near field optics, Optical properties

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Proceedings Article | 10 January 1996 Paper

Characterization of laser-induced pressure transients by means of piezoelectric PVDF films

Stefan Lohmann, Andreas Olmes, Holger Lubatschowski, Wolfgang Ertmer

Proceedings Volume 2624, (1996) https://doi.org/10.1117/12.229541

KEYWORDS: Capacitance, Resistance, Signal detection, Algorithm development, Spatial resolution, Signal processing, Polymethylmethacrylate, Aluminum, Reflection, Fourier transforms

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Proceedings Article | 10 January 1996 Paper

Influence of the ablation plume on the removal process during ArF-excimer laser photoablation

Christina Doerbecker, Holger Lubatschowski, Stefan Lohmann, Christine Ruff, Omid Kermani, Wolfgang Ertmer

Proceedings Volume 2632, (1996) https://doi.org/10.1117/12.229576

KEYWORDS: Laser ablation, Signal attenuation, Laser beam diagnostics, Natural surfaces, Polymethylmethacrylate, Excimer lasers, Pulsed laser operation, Laser tissue interaction, Absorption, Tissues

Read Abstract +

Proceedings Article | 3 January 1995 Paper

Diffusing fiber tips for high-power medical laser applications

Christoph Schmitz, Stefan Spaniol, Volkhard Abraham, Naim Ashraf, Wolfgang Neuberger, Wolfgang Ertmer

Proceedings Volume 2631, (1995) https://doi.org/10.1117/12.229180

KEYWORDS: Photodynamic therapy, Optical fibers, Cervix, Diffusers, Light scattering, LASIK, Glasses, Silica, Laser therapeutics, Fiber optics

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Proceedings Article | 17 August 1994 Paper

Calculation of isofluence contours for PDT application

Stefan Spaniol, Dagmar Kobe, Volkhard Abraham, Peter Nothof, Stephan Schmidt, Dieter Krebs, Wolfgang Ertmer

Proceedings Volume 2134, (1994) https://doi.org/10.1117/12.182941

KEYWORDS: Photodynamic therapy, Tissues, Monte Carlo methods, Tissue optics, Integrating spheres, Statistical analysis, Refractive index, 3D modeling, Natural surfaces, Tumors

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Proceedings Article | 19 July 1994 Paper

Comparison of Ti:sapphire laser and excimer-laser-pumped dye laser for PDT with Zn(II)-phthalocyanine

Volkhard Abraham, Stefan Spaniol, Birgit Schultes, Stephan Schmidt, Wolfgang Ertmer

Proceedings Volume 2133, (1994) https://doi.org/10.1117/12.179971

KEYWORDS: Absorption, Dye lasers, Excimer lasers, Pulsed laser operation, Tissue optics, Sapphire lasers, Photodynamic therapy, Laser systems engineering, Continuous wave operation, Mass attenuation coefficient

Read Abstract +

Proceedings Article | 1 March 1994 Paper

Computer modeling of light distributions for diverse photodynamic therapy applicators

Dagmar Kobe, Stefan Spaniol, Wolfgang Beyer, Wolfgang Ertmer

Proceedings Volume 2078, (1994) https://doi.org/10.1117/12.168708

KEYWORDS: Tissue optics, Monte Carlo methods, Tissues, Scattering, 3D modeling, Natural surfaces, Photons, Photodynamic therapy, Absorption, Reflection

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Proceedings Article | 1 March 1994 Paper

Photodynamic laser therapy with antibody-coupled phthalocyanine

Birgit Schultes, Stefan Spaniol, Stephan Schmidt, Wolfgang Ertmer, Hans-Juergen Biersack, Dieter Krebs

Proceedings Volume 2078, (1994) https://doi.org/10.1117/12.168709

KEYWORDS: Tumors, Photodynamic therapy, Titanium, Sapphire lasers, Laser irradiation, Skin, Absorbance, Molecules, Tumor growth modeling, Tissues

Read Abstract +

Proceedings Article | 1 February 1994 Paper

Thermal and mechanical damage of corneal tissue after free-running and Q-switched mid-infrared laser ablation

Flurin Koenz, Martin Frenz, Hans Pratisto, Heinz Weber, Holger Lubatschowski, Omid Kermani, Wolfgang Ertmer, Hans Altermatt, Thomas Schaffner

Proceedings Volume 2077, (1994) https://doi.org/10.1117/12.168015

KEYWORDS: Laser ablation, Cornea, Laser tissue interaction, Tissues, Pulsed laser operation, Er:YAG lasers, Q switched lasers, Scanning electron microscopy, Mid-IR, Q switching

Read Abstract +

Showing 5 of 64 publications

Conference Committee Involvement (24)

Optical Methods for Inspection, Characterization, and Imaging of Biomaterials VII

23 June 2025 | Munich, Germany

Optical Methods for Inspection, Characterization, and Imaging of Biomaterials VI

26 June 2023 | Munich, Germany

Optical Methods for Inspection, Characterization, and Imaging of Biomaterials V

21 June 2021 | Online Only, Germany

Complex Light and Optical Forces XV

6 March 2021 | Online Only, California, United States

Complex Light and Optical Forces XIV

4 February 2020 | San Francisco, California, United States

Optical Methods for Inspection, Characterization, and Imaging of Biomaterials IV

24 June 2019 | Munich, Germany

Complex Light and Optical Forces XIII

5 February 2019 | San Francisco, California, United States

Complex Light and Optical Forces XII

30 January 2018 | San Francisco, California, United States

Optical Methods for Inspection, Characterization, and Imaging of Biomaterials

26 June 2017 | Munich, Germany

Complex Light and Optical Forces XI

31 January 2017 | San Francisco, California, United States

Complex Light and Optical Forces X

16 February 2016 | San Francisco, California, United States

Optical Methods for Inspection, Characterization, and Imaging of Biomaterials II

22 June 2015 | Munich, Germany

Complex Light and Optical Forces IX

11 February 2015 | San Francisco, California, United States

Complex Light and Optical Forces VIII

4 February 2014 | San Francisco, California, United States

Optical Methods for Inspection, Characterization, and Imaging of Biomaterials

15 May 2013 | Munich, Germany

Complex Light and Optical Forces VII

5 February 2013 | San Francisco, California, United States

Complex Light and Optical Forces VI

25 January 2012 | San Francisco, California, United States

Complex Light and Optical Forces V

26 January 2011 | San Francisco, California, United States

Complex Light and Optical Forces IV

27 January 2010 | San Francisco, California, United States

Complex Light and Optical Forces III

28 January 2009 | San Jose, California, United States

Complex Light and Optical Forces II

21 January 2008 | San Jose, California, United States

Complex Light and Optical Forces

24 January 2007 | San Jose, California, United States

Nanomanipulation with Light II

23 January 2006 | San Jose, California, United States

Nanomanipulation with Light

25 January 2005 | San Jose, California, United States

Showing 5 of 24 Conference Committees

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