Dr. Wojciech S. Góra Profile

Dr. Wojciech S. Góra

Research Associate at Heriot-Watt Univ

SPIE Involvement:

Author

Publications (10)

Proceedings Article | 2 March 2020 Presentation + Paper

Impact of laser texturing parameters and processing environment in the anti-wetting transition of nanosecond laser generated textures

J. P. Godoy Vilar, W. Góra, T. L. See, D. Hand

Proceedings Volume 11268, 1126818 (2020) https://doi.org/10.1117/12.2544908

KEYWORDS: Laser processing, Argon, Pulsed laser operation, Metals

Read Abstract +

Proceedings Article | 17 February 2017 Paper

Precision resection of lung cancer in a sheep model using ultrashort laser pulses

Rainer Beck, Syam Mohan P. Mohanan, Wojciech Góra, Chris Cousens, Jeanie Finlayson, Mark Dagleish, David Griffiths, Jonathan Shephard

Proceedings Volume 10094, 1009405 (2017) https://doi.org/10.1117/12.2252215

KEYWORDS: Lung cancer, Ultrafast lasers, Laser tissue interaction, Laser ablation, Laser coagulation, Lung, Picosecond phenomena, Tissues, Ultrafast phenomena, Pulsed laser operation, Plasma

Read Abstract +

Proceedings Article | 15 February 2017 Presentation + Paper

Investigation of the efficacy of ultrafast laser in large bowel excision

Syam Mohan P. Mohanan, Rainer Beck, Wojciech Góra, Sarah Perry, Mike Shires, David Jayne, Duncan Hand, Jonathan Shephard

Proceedings Volume 10062, 1006207 (2017) https://doi.org/10.1117/12.2251956

KEYWORDS: Tissues, Laser ablation, Colon, Picosecond phenomena, Surgery, Ultrafast lasers, Plasma, Ultrafast phenomena, Pulsed laser operation, Colorectal cancer, Laser tissue interaction, Natural surfaces

Read Abstract +

Proceedings Article | 7 March 2016 Paper

Precision resection of intestine using ultrashort laser pulses

Rainer Beck, Wojciech Gora, David Jayne, Duncan Hand, Jonathan Shephard

Proceedings Volume 9706, 97060P (2016) https://doi.org/10.1117/12.2209589

KEYWORDS: Intestine, Laser ablation, Ultrafast phenomena, Colorectal cancer, Laser therapeutics, Ultrafast lasers, Tissues, Picosecond phenomena, Laser tissue interaction, Plasma, Pulsed laser operation, Injuries

Read Abstract +

Proceedings Article | 29 February 2016 Paper

Microsecond enamel ablation with 10.6µm CO2 laser radiation

W. Góra, A. McDonald, D. Hand, J. Shephard

Proceedings Volume 9692, 969205 (2016) https://doi.org/10.1117/12.2207455

KEYWORDS: Laser tissue interaction, Laser ablation, Carbon dioxide lasers, Tissues, Laser dentistry, Teeth, Surgery, Absorption, Natural surfaces, Laser processing, Carbon monoxide, Gas lasers

Read Abstract +

Lasers have been previously been used for dental applications, however there remain issues with thermally-induced cracking. In this paper we investigate the impact of pulse length on CO₂ laser ablation of human dental enamel. Experiments were carried in vitro on molar teeth without any modification to the enamel surface, such as grinding or polishing. In addition to varying the pulse length, we also varied pulse energy and focal position, to determine the most efficient ablation of dental hard tissue and more importantly to minimize or eradicate cracking. The maximum temperature rise during the multi pulse ablation process was monitored using a set of thermocouples embedded into the pulpal chamber. The application of a laser device in dental surgery allows removal of tissue with higher precision, which results in minimal loss of healthy dental tissue. In this study we use an RF discharge excited CO₂ laser operating at 10.6μm. The wavelength of 10.6 μm overlaps with a phosphate band (PO₃^-4) absorption in dental hard tissue hence the CO₂ laser radiation has been selected as a potential source for modification of the tissue. This research describes an in-depth analysis of single pulse laser ablation. To determine the parameters that are best suited for the ablation of hard dental tissue without thermal cracking, a range of pulse lengths (10-200 μs), and fluences (0-100 J/cm²) are tested. In addition, different laser focusing approaches are investigated to select the most beneficial way of delivering laser radiation to the surface (divergent/convergent beam). To ensure that these processes do not increase the temperature above the critical threshold and cause the necrosis of the tissue a set of thermocouples was placed into the pulpal chambers. Intermittent laser radiation was investigated with and without application of a water spray to cool down the ablation site and the adjacent area. Results show that the temperature can be kept below the critical threshold either by using water spray or by decreasing the repetition rate. We demonstrate that CO₂ laser pulses with pulse lengths in the regime of 10 μs can provide precise enamel tissue removal without introducing any unwanted thermal damage.

Proceedings Article | 15 July 2015 Paper

Ultrafast laser machining of porcine sclera

W. Góra, R. Carter, B. Dhillon, D. Hand, J. Shephard

Proceedings Volume 9542, 95420T (2015) https://doi.org/10.1117/12.2183627

KEYWORDS: Picosecond phenomena, Tissues, Laser tissue interaction, Sclera, Ultrafast lasers, Scanning electron microscopy, Laser ablation, Photomicroscopy, Pulsed laser operation, In vitro testing

Read Abstract +

Proceedings Article | 15 July 2015 Paper

Precision machining of pig intestine using ultrafast laser pulses

Rainer Beck, Wojciech Góra, Richard Carter, Sonny Gunadi, David Jayne, Duncan Hand, Jonathan Shephard

Proceedings Volume 9542, 95421B (2015) https://doi.org/10.1117/12.2197930

KEYWORDS: Laser ablation, Ultrafast lasers, Laser tissue interaction, Intestine, Tissues, Laser therapeutics, Picosecond phenomena, Colorectal cancer, Photomicroscopy, Pulsed laser operation

Read Abstract +

Proceedings Article | 12 March 2015 Paper

High precision laser sclerostomy

W. Góra, A. Urich, L. McIntosh, R. Carter, Clive Wilson, B. Dhillon, D. Hand, J. Shephard

Proceedings Volume 9307, 93071Y (2015) https://doi.org/10.1117/12.2079146

KEYWORDS: Tissues, Picosecond phenomena, Laser tissue interaction, Sclera, Laser ablation, Scanning electron microscopy, Photomicroscopy, Pulsed laser operation, Plasma, Laser damage threshold

Read Abstract +

Proceedings Article | 26 March 2013 Paper

Picosecond laser ablation of porcine sclera

Wojciech Góra, Eleanor Harvey, Baljean Dhillon, Simon Parson, Robert R. Maier, Duncan Hand, Jonathan Shephard

Proceedings Volume 8567, 856726 (2013) https://doi.org/10.1117/12.2004828

KEYWORDS: Laser ablation, Sclera, Picosecond phenomena, Scanning electron microscopy, Pulsed laser operation, Tissues, Photomicroscopy, Head, Laser tissue interaction, Laser applications

Read Abstract +

Proceedings Article | 10 June 2011 Paper

Optimization of erbium doped photonic crystal fiber laser

L. Sojka, W. Gora, P. Jaworski, E. Beres-Pawlik, S. Sujecki, T. Benson, P. Mergo

Proceedings Volume 8010, 80100P (2011) https://doi.org/10.1117/12.897573

KEYWORDS: Photonic crystal fibers, Fiber lasers, Erbium, Absorption, Polarization, Ions, Erbium lasers, Refractive index, Laser crystals, Electromagnetism

Read Abstract +

Showing 5 of 10 publications

View contact details

UPDATE YOUR PROFILE

Is this your profile? Update it now.

Sign into your SPIE.org account

Don’t have a profile and want one?

Create an account on SPIE.org

Keywords/Phrases

Search In:

Publication Years