Dr. Rajesh N. Raman Profile

Dr. Rajesh N. Raman

Research Scientist at Lawrence Livermore National Lab

SPIE Involvement:

Author

Area of Expertise:

Diagnostic optical imaging , optical spectroscopy

Publications (33)

SPIE Journal Paper | 3 December 2024

Repair strategy for fused silica wedged focus lens with high-density filamentary damage

Keturah Palma, Rajesh Raman, Christopher Miller, Scott Trummer, David Cross, Christopher Carr

OE, Vol. 64, Issue 03, 031006, (December 2024) https://doi.org/10.1117/12.10.1117/1.OE.64.3.031006

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Proceedings Article | 30 November 2023 Presentation + Paper

Repair strategies for fused silica wedged focus lens with high density filamentary damage

Keturah Palma, Rajesh Raman, Chris Miller, Scott Trummer, David Cross, Wren Carr

Proceedings Volume PC12726, PC127260H (2023) https://doi.org/10.1117/12.2686090

KEYWORDS: National Ignition Facility, Silica, Beam diameter, Laser induced damage, Microscopy, Microscopes, Image analysis, Yield improvement, Plasma, Laser energy

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Proceedings Article | 3 December 2022 Poster + Presentation

Impact of filamentation on the lifetime of the fused silica wedged focus lens under repair for surface damage

Keturah Palma, Rajesh Raman, Chris Miller, Scott Trummer, David Cross, C. Carr

Proceedings Volume PC12300, PC1230011 (2022) https://doi.org/10.1117/12.2643092

KEYWORDS: National Ignition Facility, Silica, Laser induced damage, Physics, Optical microscopy, Microscopy, Laser optics, Information security, Fusion energy

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Proceedings Article | 2 December 2022 Presentation + Paper

Performance of multiple cone arrays as shadow cone blockers on NIF

Isaac Bass, Eyal Feigenbaum, Rajesh Raman, Keturah Palma, Jim Vickers, Gabe Guss, Mary Norton, Wren Carr

Proceedings Volume 12300, 123000E (2022) https://doi.org/10.1117/12.2642917

KEYWORDS: National Ignition Facility, Microscopes, Silica, Gas lasers, Raster graphics, Objectives, Collimation, Charge-coupled devices, Carbon monoxide, Surface conduction electron emitter displays

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Proceedings Article | 11 September 2020 Poster + Presentation

Mitigating damage growth on National Ignition Facility silica optics by shadowing with ablated cone structures

Rajesh Raman, Eyal Feigenbaum, Isaac Bass, Gabe Guss, Keturah Palma, Christopher Carr

Proceedings Volume 11514, 115141P (2020) https://doi.org/10.1117/12.2571934

KEYWORDS: National Ignition Facility, Silica, Efficient operations, High power lasers, Laser systems engineering, Laser damage threshold

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Proceedings Article | 27 December 2019 Paper

A shadowing technique to arrest laser-induced damage growth on exit surface silica

Rajesh Raman, Raminder Garcha, Michael Rushford, Gabe Guss, C. Carr

Proceedings Volume 11173, 1117303 (2019) https://doi.org/10.1117/12.2539152

KEYWORDS: National Ignition Facility, Silica, Laser induced damage, Pulsed laser operation, Laser damage threshold, Gas lasers, Laser energy, Laser systems engineering, Optical components, Optics manufacturing

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Proceedings Article | 20 November 2019 Presentation + Paper

Damage performance of fused silica debris shield at the National Ignition Facility

Zhi Liao, C. Carr, D. Cross, C. Miller, P. Miller, M. Monticelli, B. Olejniczak, R. Raman, D. VanBlarcom, B. Welday, P. Whitman, L. Wong, T. Suratwala

Proceedings Volume 11173, 111730Y (2019) https://doi.org/10.1117/12.2536452

KEYWORDS: National Ignition Facility, Inspection, Silica, Laser optics, Particles, Diagnostics, Contamination, Laser induced damage

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Proceedings Article | 13 December 2018 Presentation + Paper

Fate of nanosecond-pulsed 351 nm laser-ejected glass contaminants on fused silica under subsequent laser exposure

Rajesh Raman, Christopher Miller, Raminder Garcha, Mary Norton, C. Carr

Proceedings Volume 10805, 108051L (2018) https://doi.org/10.1117/12.2501958

KEYWORDS: Particles, Glasses, Silica, National Ignition Facility, Laser induced damage, Pulsed laser operation, Reflection, Laser glasses, Soda-lime glass, Laser welding

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Proceedings Article | 30 November 2018 Presentation + Paper

Contamination-driven laser-induced damage model at the National Ignition Facility

Zhi Liao, Rajesh Raman, David Cross, W. Carr

Proceedings Volume 10748, 107480J (2018) https://doi.org/10.1117/12.2320358

KEYWORDS: Particles, Data modeling, Laser induced damage, National Ignition Facility, Performance modeling, Laser optics, Silica, Laser development, Optical microscopy, UV optics

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Proceedings Article | 16 November 2018 Paper

Characterization and repair of small damage sites and their impact on the lifetime of fused silica optics on the National Ignition Facility

Christopher Miller, Laura Kegelmeyer, Mike Nostrand, Rajesh Raman, David Cross, Zhi Liao, Raminder Garcha, Christopher Carr

Proceedings Volume 10805, 108051D (2018) https://doi.org/10.1117/12.2501839

KEYWORDS: National Ignition Facility, Silica, Image classification, Classification systems, Machine learning, Microscopy, Convolutional neural networks, Image resolution, Particles, Laser systems engineering

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Proceedings Article | 16 November 2018 Paper

Mitigation of a novel phase-defect-induced laser damage mechanism on NIF final optics

M. Nostrand, P. Miller, P. Whitman, W. Carr, D. Cross, A. Peer, R. Raman, C. Widmayer, T. Suratwala

Proceedings Volume 10805, 108051I (2018) https://doi.org/10.1117/12.2501956

KEYWORDS: National Ignition Facility, Reflection, Laser induced damage, UV optics, Ray tracing, Diffraction, Physics, Raman spectroscopy, Silica, Ultraviolet radiation

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Proceedings Article | 23 February 2018 Paper

Laser pre-exposure to mitigate damage on microparticle-contaminated fused silica surface in high power laser systems

Rajesh Raman, David Cross, Mary Norton, Jeff Bude, Raminder Garcha, Tylisia Wallace, C. Wren Carr

Proceedings Volume 10520, 105201T (2018) https://doi.org/10.1117/12.2293034

KEYWORDS: Particles, Silica, National Ignition Facility, Pulsed laser operation, High power lasers, Laser systems engineering, Laser induced damage, Scanning electron microscopy, Laser damage threshold, Contamination

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Proceedings Article | 19 February 2018 Presentation + Paper

Multi-color autofluorescence and scattering spectroscopy provides rapid assessment of kidney function following ischemic injury

Rajesh Raman, Chris Pivetti, Rajendra Ramsamooj, Christoph Troppmann, Stavros Demos

Proceedings Volume 10489, 104890C (2018) https://doi.org/10.1117/12.2292293

KEYWORDS: Kidney, Injuries, Blood, Ischemia, Tissues, Ultraviolet radiation, Absorption, Spectroscopy, Scattering, Signal processing

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Proceedings Article | 29 November 2017 Open Access

Damage sources for the NIF Grating Debris Shield (GDS) and methods for their mitigation

C. Carr, J. Bude, P. Miller, T. Parham, P. Whitman, M. Monticelli, R. Raman, D. Cross, B. Welday, F. Ravizza, T. Suratwala, J. Davis, M. Fischer, R. Hawley, H. Lee, M. Matthews, M. Norton, M. Nostrand, D. Vanblarcom, S. Sommer

Proceedings Volume 10447, 1044702 (2017) https://doi.org/10.1117/12.2281202

KEYWORDS: Particles, National Ignition Facility, Glasses, Antireflective coatings, Silica, Laser induced damage

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SPIE Journal Paper | 3 May 2017 Open Access

Predictive assessment of kidney functional recovery following ischemic injury using optical spectroscopy

Rajesh Raman, Christopher Pivetti, Rajendra Ramsamooj, Christoph Troppmann, Stavros Demos

JBO, Vol. 22, Issue 05, 056001, (May 2017) https://doi.org/10.1117/12.10.1117/1.JBO.22.5.056001

KEYWORDS: Kidney, Injuries, Blood, Atrial fibrillation, Tissues, Tissue optics, Ischemia, Absorption, Scattering, Light scattering

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Proceedings Article | 6 December 2016 Open Access

Laser-matter coupling mechanisms governing particulate-induced damage on optical surfaces

M. Matthews, E. Feigenbaum, S. Demos, R. Raman, S. R. Qiu, N. Shen, C. Harris, R. Negres, M. Norton, D. Cross, A. Rubenchik

Proceedings Volume 10014, 1001402 (2016) https://doi.org/10.1117/12.2244981

KEYWORDS: Near field optics, Particles, Pulsed laser operation, Plasma, Silica, Aluminum, Scattering, Laser scattering, Light scattering, Metals

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Proceedings Article | 6 December 2016 Paper

Laser-induced Hertzian fractures on the exit surface of silica glass deposited with metal micro-spheres

E. Feigenbaum, R. Raman, D. Cross, C. Carr, M. Matthews

Proceedings Volume 10014, 1001406 (2016) https://doi.org/10.1117/12.2245047

KEYWORDS: Particles, Silica, Metals, Laser induced damage, Plasma, Aluminum, Glasses, Amplifiers, Cadmium sulfide, Optical spheres

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Proceedings Article | 23 November 2015 Paper

Light scattering from laser-induced shallow pits on silica exit surfaces

E. Feigenbaum, R. Raman, N. Nielsen, M. Matthews

Proceedings Volume 9632, 96320H (2015) https://doi.org/10.1117/12.2195504

KEYWORDS: Laser scattering, Scattering, Light scattering, Silica, Glasses, Scatter measurement, Metals, Particles, Statistical modeling, Ultraviolet radiation

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Proceedings Article | 23 November 2015 Paper

Morphology of ejected debris from laser super-heated fused silica following exit surface laser-induced damage

Stavros Demos, Raluca Negres, Rajesh Raman, Michael Feit, Kenneth Manes, Alexander Rubenchik

Proceedings Volume 9632, 96320S (2015) https://doi.org/10.1117/12.2195501

KEYWORDS: Particles, Laser induced damage, Silica, Foam, Dielectrics, Temperature metrology, Pulsed laser operation, Optical fibers, Laser systems engineering, Liquids, Explosives, Scanning electron microscopy, Materials processing

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Proceedings Article | 23 September 2015 Paper

Depth determination of critical fluence-limiting defects within planarized and non-planarized mirror coatings

Christopher Stolz, Justin Wolfe, Paul Mirkarimi, James Folta, John Adams, Marlon Menor, Rajesh Raman, Norm Neilsen, Mary Norton, Ronald Luthi, Nick Teslich, Carmen Menoni, Dinesh Patel

Proceedings Volume 9627, 96271C (2015) https://doi.org/10.1117/12.2197349

KEYWORDS: Silica, Mirrors, Laser induced damage, Thin film coatings, Etching, Optical coatings, Resistance, Multilayers, Scanning electron microscopy, Thin films

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Proceedings Article | 14 November 2013 Paper

Comparison of material response in fused silica and KDP following exit surface laser- induced breakdown

Stavros Demos, Raluca Negres, Rajesh Raman, Alexander Rubenchik, Michael Feit

Proceedings Volume 8885, 88850W (2013) https://doi.org/10.1117/12.2030481

KEYWORDS: Silica, Particles, Laser induced damage, Materials processing, Laser systems engineering, Laser energy, Pulsed laser deposition, Laser beam diagnostics, Crystals, Plasma

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Proceedings Article | 23 November 2011 Paper

Estimation of the transverse stimulated Raman scattering gain coefficient in KDP and DKDP at 2-omega, 3-omega, and 4-omega

Stavros Demos, Rajesh Raman, Steven Yang, Raluca Negres, Kathleen Schaffers, Mark Henesian

Proceedings Volume 8190, 81900S (2011) https://doi.org/10.1117/12.899266

KEYWORDS: Raman scattering, Raman spectroscopy, Crystals, Laser crystals, Harmonic generation, Laser scattering, Laser systems engineering, Polarization, Scattering, Laser induced damage

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SPIE Journal Paper | 1 January 2011 Open Access

Time-resolved microscope system to image material response following localized laser energy deposition: exit surface damage in fused silica as a case example

Rajesh Raman, Raluca Negres, Stavros Demos

OE, Vol. 50, Issue 01, 013602, (January 2011) https://doi.org/10.1117/12.10.1117/1.3526689

KEYWORDS: Imaging systems, Particles, Microscopes, Polarization, Silica, Laser energy, Laser beam diagnostics, Image processing, Laser induced damage, Temporal resolution

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Proceedings Article | 1 December 2010 Paper

Imaging the early material response associated with exit surface damage in fused silica

Stavros Demos, Rajesh Raman, Raluca Negres

Proceedings Volume 7842, 78420M (2010) https://doi.org/10.1117/12.867724

KEYWORDS: Silica, Pulsed laser operation, Imaging systems, Polarization, Temporal resolution, Spatial resolution, Picosecond phenomena, Laser beam diagnostics, Microscopes, Laser systems engineering

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Proceedings Article | 23 February 2010 Paper

Optical spectroscopy approach for the predictive assessment of kidney functional recovery following ischemic injury

Rajesh Raman, Christopher Pivetti, Alexander Rubenchik, Dennis Matthews, Christoph Troppmann, Stavros Demos

Proceedings Volume 7561, 756109 (2010) https://doi.org/10.1117/12.842413

KEYWORDS: Kidney, Injuries, Tissues, Light scattering, Ischemia, Blood, Tissue optics, Atrial fibrillation, Optical spectroscopy, Scattering

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Proceedings Article | 18 February 2010 Paper

Time-resolved imaging of material response following laser-induced breakdown in the bulk and surface of fused silica

Rajesh Raman, Raluca Negres, Paul DeMange, Stavros Demos

Proceedings Volume 7581, 75810D (2010) https://doi.org/10.1117/12.842301

KEYWORDS: Particles, Imaging systems, Polarization, Microscopes, Laser induced damage, Silica, Image processing, Absorption, Backscatter, Spatial resolution

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Proceedings Article | 31 December 2009 Paper

Imaging system to measure kinetics of material cluster ejection during exit-surface damage initiation and growth in fused silica

Rajesh Raman, Raluca Negres, Stavros Demos

Proceedings Volume 7504, 750418 (2009) https://doi.org/10.1117/12.836922

KEYWORDS: Particles, Imaging systems, Microscopes, Image processing, Silica, Polarization, Laser beam diagnostics, Backscatter, Pulsed laser operation, Spatial resolution

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SPIE Journal Paper | 1 March 2009 Open Access

Evaluation of the contribution of the renal capsule and cortex to kidney autofluorescence intensity under ultraviolet excitation

Rajesh Raman, Christopher Pivetti, Alexander Rubenchik, Dennis Matthews, Christoph Troppmann, Stavros Demos

JBO, Vol. 14, Issue 02, 020505, (March 2009) https://doi.org/10.1117/12.10.1117/1.3094948

KEYWORDS: Kidney, Atrial fibrillation, Tissues, Ultraviolet radiation, Signal attenuation, Luminescence, Microscopy, Mode conditioning cables, Blood, Mathematical modeling

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Proceedings Article | 20 February 2008 Paper

Autofluorescence dynamics during reperfusion following long-term renal ischemia in a rat model

Rajesh Raman, Christopher Pivetti, Dennis Matthews, Christoph Troppmann, Stavros Demos

Proceedings Volume 6853, 685318 (2008) https://doi.org/10.1117/12.762363

KEYWORDS: Kidney, Injuries, Ischemia, Tissues, Tissue optics, Light scattering, In vivo imaging, Optical properties, Oxygen, Natural surfaces

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Proceedings Article | 19 February 2007 Paper

In-vivo quantification of autofluorescence dynamics during renal ischemia and reperfusion under dual-UV excitation

Rajesh Raman, Christopher Pivetti, Dennis Matthews, Christoph Troppmann, Stavros Demos

Proceedings Volume 6441, 64410J (2007) https://doi.org/10.1117/12.699744

KEYWORDS: Ischemia, Kidney, Injuries, Tissues, Tissue optics, In vivo imaging, Luminescence, Surgery, Mode conditioning cables, Oxygen

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Proceedings Article | 22 February 2006 Paper

In vivo spectroscopic monitoring of renal ischemia and reperfusion in a rat model

Rajesh Raman, Christopher Pivetti, Dennis Matthews, Christoph Troppmann, Stavros Demos

Proceedings Volume 6091, 609103 (2006) https://doi.org/10.1117/12.645344

KEYWORDS: Ischemia, Kidney, Tissues, Injuries, In vivo imaging, Blood, Light scattering, Optical spectroscopy, Spectroscopy, Image filtering

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Proceedings Article | 22 February 2006 Paper

Real-time imaging of tissue microstructures using intrinsic optical signatures

Bevin Lin, Chad Lieber, Jason Fitzgerald, Andromachi Michalopoulou, Rajesh Raman, Christopher Pivetti, Christoph Troppmann, Dennis Matthews, Stavros Demos

Proceedings Volume 6091, 60910G (2006) https://doi.org/10.1117/12.644954

KEYWORDS: Tissue optics, Tissues, Light scattering, Microscopes, Image filtering, Image enhancement, Real time imaging, Image acquisition, Objectives, Confocal microscopy

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SPIE Journal Paper | 1 July 2005 Open Access

Real-time assessment of in vivo renal ischemia using laser autofluorescence imaging

Jason Fitzgerald, Andromachi Michalopoulou, Christopher Pivetti, Rajesh Raman, Christoph Troppmann, Stavros Demos

JBO, Vol. 10, Issue 04, 044018, (July 2005) https://doi.org/10.1117/12.10.1117/1.1993327

KEYWORDS: Ischemia, Kidney, Injuries, Spectroscopy, In vivo imaging, Control systems, Absorption, Light scattering, Optical spectroscopy, Tissues

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