Dr. Roger Courchinoux Profile

Dr. Roger Courchinoux

at Commissariat à l'Énergie Atomique

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Author

Publications (27)

Proceedings Article | 18 December 2024 Presentation

ELAN: a testbed for testing laser-induced damage of large and thick optics for Laser Mégajoule

Charles Bouyer, Laurent Lamaignère, Roger Courchinoux, Thierry Donval

Proceedings Volume PC13190, PC131900C (2024) https://doi.org/10.1117/12.3032518

KEYWORDS: Laser optics, Laser induced damage, Nd:YAG lasers, Spatial light modulators, Nonlinear control, Windows, Vacuum, Simulations, Polishing, Phase shift keying

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Proceedings Article | 7 October 2020 Presentation + Paper

Damage probability versus damage density: analysis from tests using small beams versus large beams

Laurent Lamaignère, Matthieu Veinhard, Florian Tournemenne, Charles Bouyer, Romain Parreault, Roger Courchinoux, Jean-Yves Natoli, Claude Rouyer, Stéphane Bouillet

Proceedings Volume 11514, 115140E (2020) https://doi.org/10.1117/12.2571834

KEYWORDS: Analytical research, Beam shaping, Statistical analysis, Laser induced damage, Resistance, Laser damage threshold, Laser sources

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Proceedings Article | 8 July 2019 Paper

Laser-induced damage of high power systems: phenomenology and mechanisms

L. Lamaignère, R. Courchinoux, N. Roquin, R. Parreault, T. Donval

Proceedings Volume 11063, 1106309 (2019) https://doi.org/10.1117/12.2537106

KEYWORDS: Laser induced damage, High power lasers, Fractal analysis, Optical components, Laser beam diagnostics, Beam shaping, Silica, Spatial light modulators, Modulation, Optical testing

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Proceedings Article | 13 November 2017 Paper

MELBA: a fully customizable laser for damage experiments

Matthieu Veinhard, Odile Bonville, Roger Courchinoux, Romain Parreault, Jean-Yves Natoli, Laurent Lamaignère

Proceedings Volume 10447, 104471U (2017) https://doi.org/10.1117/12.2281125

KEYWORDS: Laser induced damage, Wavefronts, Microscopes, Image processing, Silica, Optical testing, Diagnostics, Laser systems engineering, Modulation, Laser beam propagation

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Proceedings Article | 13 November 2017 Paper

Growth of laser-induced damage on the exit surface of fused silica optics with a millimetric laser beam

Matthieu Veinhard, Odile Bonville, Roger Courchinoux, Romain Parreault, Jean-Yves Natoli, Laurent Lamaignère

Proceedings Volume 10447, 1044708 (2017) https://doi.org/10.1117/12.2281124

KEYWORDS: Fractal analysis, Laser induced damage, Silica, Microscopes, Laser energy, Pulsed laser operation, Surface finishing, Image segmentation, Laser optics

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Proceedings Article | 6 December 2016 Open Access

Investigation of mechanisms leading to laser damage morphology

L. Lamaignère, M. Chambonneau, R. Diaz, P. Grua, R. Courchinoux, J.-Y. Natoli, J. L. Rullier

Proceedings Volume 10014, 1001413 (2016) https://doi.org/10.1117/12.2244827

KEYWORDS: Silica, Plasma, Laser ablation, Laser induced damage, Modulation, Ionization, Spatial light modulators, Pulsed laser operation, Absorption, Tellurium

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The original damage ring pattern at the exit surface of fused silica induced by highly modulated nanosecond infrared laser pulses demonstrates the time dependence of damage morphology. Such a damage structure is used to study the dynamics of the plasma issued from open cracks. This pattern originates from electron avalanche in this plasma, which simultaneously leads to an ionization front displacement in air and a silica ablation process. Experiments have shown that the propagation speed of the detonation wave reaches about 20 km/s and scales as the cube root of the laser intensity, in good agreement with theoretical hydrodynamics modeling. During this presentation, we present the different phases and the associated mechanisms leading to this peculiar morphology: • During an incubation phase, a precursor defect provides energy deposit that drives the near surface material into a plasma state. • Next the silica plasma provides free electrons in the surrounding air, under laser irradiation an electron avalanche is initiated and generates a breakdown wave. • Then this breakdown wave leads to an expansion of the air plasma. This latter is able to heat strongly the silica surface as well as generate free electrons in its conduction band. Hence, the silica becomes activated along the breakdown wave. • When the silica has become absorbent, an ablation mechanism of silica occurs, simultaneously with the air plasma expansion, resulting in the formation of the ring patterns in the case of these modulated laser pulses. These mechanisms are supported by experiments realized in vacuum environment. A model describing the expansion of the heated area by thermal conduction due to plasma free electrons is then presented. Next, the paper deals with the two damage formation phases that are distinguished. The first phase corresponds to the incubation of the laser flux by a subsurface defect until the damage occurrence: an incubation fluence corresponds to this phase. The second is related to the damage expansion that only refers to the energy deposit feeding the activation mechanism up to the end of the pulse: an expansion fluence corresponds to this phase. A striking feature is that the damage diameters are proportional to the fluence of expansion at a given shot fluence. Indirectly, the fluences of incubation by the precursors are then determined.

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Proceedings Article | 22 July 2016 Paper

Laser damage measurement of thick silica plates using a new laser injection scheme

D. Penninckx, R. Diaz, O. Bonville, R. Courchinoux, L. Lamaignère, J. Luce

Proceedings Volume 9983, 99830S (2016) https://doi.org/10.1117/12.2235748

KEYWORDS: Laser induced damage, Silica, Kerr effect, High power lasers, Phase modulation, Laser scattering, Continuous wave operation, Laser resonators, Q switched lasers, Q switching

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Proceedings Article | 23 November 2015 Paper

Refined metrology of spatio-temporal dynamics of nanosecond laser pulses

R. Diaz, R. Courchinoux, J. Luce, C. Rouyer, J.-L. Rullier, J.-Y. Natoli, L. Lamaignère

Proceedings Volume 9632, 96321S (2015) https://doi.org/10.1117/12.2195470

KEYWORDS: Metrology, Kerr effect, Laser metrology, Nonlinear optics, Laser beam propagation, Q switched lasers, Spatial light modulators, Streak cameras, Photodiodes, Nd:YAG lasers, Diffraction gratings, Picosecond phenomena, Resonators, Mirrors

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Proceedings Article | 26 February 2015 Paper

Laser damage resistance qualification of large optics for high power laser

L. Lamaignère, M. Chambonneau, R. Diaz, R. Courchinoux, T. Donval

Proceedings Volume 9345, 934508 (2015) https://doi.org/10.1117/12.2077421

KEYWORDS: Cameras, Beam shaping, Error analysis, Laser induced damage, High power lasers, Gaussian beams, Optical components, Optical testing, Neodymium, Metrology

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Proceedings Article | 22 September 2014 Paper

Contribution of the metrology to the study of laser induced damage with multiple longitudinal mode pulses

R. Diaz, M. Chambonneau, R. Courchinoux, J. Luce, J.-Y. Natoli, L. Lamaignère

Proceedings Volume 9238, 92380I (2014) https://doi.org/10.1117/12.2073237

KEYWORDS: Photodiodes, Streak cameras, Laser induced damage, Metrology, Nd:YAG lasers, Statistical analysis, Spatial light modulators, Frequency conversion, Laser resonators, Crystals

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Proceedings Article | 22 September 2014 Paper

Large beam damage experiments in fused silica optics at 351nm

L. Lamaignère, G. Dupuy, A. Bourgeade, A. Roques, R. Courchinoux

Proceedings Volume 9238, 92380C (2014) https://doi.org/10.1117/12.2073640

KEYWORDS: Silica, Laser induced damage, Optical components, Statistical analysis, Statistical modeling, High power lasers, Polishing, Frequency conversion, Crystals, CCD cameras

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Proceedings Article | 14 November 2013 Paper

Laser-induced damage density of thick optical components

L. Lamaignère, T. Donval, R. Diaz, R. Courchinoux

Proceedings Volume 8885, 88851Q (2013) https://doi.org/10.1117/12.2030397

KEYWORDS: Phase modulation, Laser induced damage, Optical components, Nonlinear optics, Silica, Beam propagation method, Laser beam propagation, Photodiodes, High power lasers, Beam analyzers

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Proceedings Article | 19 February 2011 Paper

LIL laser performance status

Xavier Julien, Alain Adolf, Emmanuel Bar, Vincent Beau, Edouard Bordenave, Thierry Chiès, Roger Courchinoux, Jean-Michel Di-Nicola, Christophe Féral, Patrick Gendeau, Hervé Graillot, Claire Grosset-Grange, Olivier Henry, Vincent Higonenq, Eric Journot, Lionel Lacampagne, Eric Lafond, Laurent Le Déroff, Arnaud Martinez, Loic Patissou, Alain Roques, Ludovic Thauvin, Gaston Thiell

Proceedings Volume 7916, 791610 (2011) https://doi.org/10.1117/12.874466

KEYWORDS: Diagnostics, Near field, Optical amplifiers, Plasma, Mirrors, Frequency conversion, Calibration, Picosecond phenomena, Space operations, Fusion energy

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Proceedings Article | 31 December 2009 Paper

Laser-induced surface damage density measurements of fused silica optics: a parametric study

Laurent Lamaignère, Stéphane Reyné, Thierry Donval, Roger Courchinoux, Jean-Christophe Poncetta, Bertrand Bertussi, H. Bercegol

Proceedings Volume 7504, 75041C (2009) https://doi.org/10.1117/12.836346

KEYWORDS: Laser induced damage, Beam shaping, Silica, Excimer lasers, Nd:YAG lasers, Data analysis, Metrology, Gaussian beams, Resistance, Beam analyzers

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Proceedings Article | 24 August 2009 Paper

Measuring a laser focal spot on a large intensity range: effect of optical component laser damages on the focal spot

Stéphane Bouillet, Sandrine Chico, Laurent Le Deroff, Gérard Razé, Roger Courchinoux

Proceedings Volume 7405, 74050W (2009) https://doi.org/10.1117/12.827962

KEYWORDS: Laser induced damage, Optical components, High power lasers, Fusion energy, Interferometry, Near field optics, Near field, Photodiodes, Image processing, Laser beam propagation

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Proceedings Article | 18 May 2009 Paper

Laser damage densities measurements on fused silica optics: round-robin test at 351-355 nm

Laurent Lamaignère, Marc Loiseau, Thierry Donval, Roger Courchinoux, Stéphane Bouillet, Jean-Christophe Poncetta, Bertrand Bertussi, Hervé Bercegol

Proceedings Volume 7361, 73610M (2009) https://doi.org/10.1117/12.820580

KEYWORDS: Laser induced damage, Silica, Error analysis, Beam shaping, Optical testing, Optical components, Data analysis, Gaussian beams, Metrology, Nd:YAG lasers

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Proceedings Article | 30 December 2008 Paper

Presentation and comparison of damage test procedures for fused silica and KDP crystals

L. Lamaignère, T. Donval, M. Loiseau, S. Bouillet, R. Courchinoux, J. Poncetta, Betrand Bertussi, H. Bercegol

Proceedings Volume 7132, 71320X (2008) https://doi.org/10.1117/12.804471

KEYWORDS: Crystals, Laser induced damage, Silica, Beam shaping, Error analysis, Pulsed laser operation, Data analysis, Optical components, Nd:YAG lasers, Gaussian beams

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A rasterscan test procedure [L. Lamaignère et al, Rev. Sci. Instrumen. 78, 103105 (2007)] has been implemented in order to determine low laser damage density of large aperture UV fused silica optics. This procedure was improved in terms of accuracy and repeatability and is now used for the determination of bulk damage density for KDP crystals. The large area (volume) scanned during tests permits to measure very low damage density. On small samples, small area are tested using the normalized 1/1 test procedure consisting on the irradiation of few sites at several fluences. The classical damage probability plot is converted in terms of damage density. The two testing procedures are complementary: the 1/1 mode is practical to test a wide fluence range while the rasterscan mode allows exploring low damage densities with higher accuracy. Tests have been carried out on several facilities using several pulse durations and spatial distributions. We describe the equipment, test procedure and data analysis to perform this damage test with small beams (Gaussian beams, about 1mm @ 1/e, and top hat beams). Then, beam overlap and beam shape are the two key parameters which are taken into account in order to determine damage density. After data analysis and treatment, a repeatable metrology has been obtained. Moreover, the consideration of error bars on defects distributions permits to compare data between these installations. This allows us to reach reproducibility, a necessary condition in order to share results and to make reliable predictions of laser damage resistance. Other tests are realized with larger beams (centimeter sized) and with a single shot. Due to a large beam contrast, a large fluence range is then covered. Then after data treatment, we find a good correlation between tests realised with small and large beams. This allows us to make tests with different laser characteristics (spectral modulations, pulse duration, laser polarisation) and then to study their influences on laser damage.

Proceedings Article | 25 September 2008 Paper

Characterizations of UV-laser damage on fused silica surfaces

Philippe Cormont, Stéphanie Palmier, Bertrand Bertussi, Roger Courchinoux, Gael Gaborit, Laurent Gallais, Laurent Lamaignère, Philippe Legros, Jean-Luc Rullier, Hervé Bercegol

Proceedings Volume 7102, 71020U (2008) https://doi.org/10.1117/12.797407

KEYWORDS: Excimer lasers, Confocal microscopy, Pulsed laser operation, Nd:YAG lasers, Silica, Laser induced damage, Polishing, Excimers, Mirrors, Laser development

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Proceedings Article | 18 January 2007 Paper

Study of the evolution of mechanical defects on silica samples under laser irradiation at 355 nm

M. Josse, H. Bercegol, R. Courchinoux, T. Donval, L. Lamaignère, B. Pussacq, J. L. Rullier

Proceedings Volume 6403, 64030E (2007) https://doi.org/10.1117/12.695453

KEYWORDS: Silica, Laser induced damage, Optical components, Laser irradiation, Optical microscopes, Surface finishing, Polishing, Raster graphics, High power lasers, Calibration

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Proceedings Article | 7 February 2006 Paper

Effects of scratch speed on laser-induced damage

M. Josse, J.L. Rullier, R. Courchinoux, T. Donval, L. Lamaignère, H. Bercegol

Proceedings Volume 5991, 599106 (2006) https://doi.org/10.1117/12.638762

KEYWORDS: Laser induced damage, Silica, Laser irradiation, Microscopes, Optical components, Surface finishing, Polishing, Optical microscopes, High power lasers, Nd:YAG lasers

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Proceedings Article | 21 February 2005 Paper

Computer-controlled measurements of laser-induced damage statistics on large optics

Michel Josse, Roger Courchinoux, Laurent Lamaignere, Jean-Christophe Poncetta, Thierry Donval, Herve Bercegol

Proceedings Volume 5647, (2005) https://doi.org/10.1117/12.585272

KEYWORDS: Laser induced damage, Argon ion lasers, CCD cameras, Nd:YAG lasers, Statistical analysis, Optical testing, Pulsed laser operation, Raster graphics, Beam shaping, Data analysis

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Proceedings Article | 21 February 2005 Paper

Observation of laser-induced damage on fused silica initiated by scratches

Herve Bercegol, Roger Courchinoux, Michel Josse, Jean Luc Rullier

Proceedings Volume 5647, (2005) https://doi.org/10.1117/12.585290

KEYWORDS: Silica, Laser induced damage, Calibration, Nd:YAG lasers, Surface finishing, Argon ion lasers, High power lasers, Laser welding, Polishing, Optical microscopes

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Proceedings Article | 21 February 2005 Paper

Laser damaged optics induced by chromium particle contamination

Stephanie Palmier, Isabelle Tovena, Roger Courchinoux, Michel Josse, Jean Luc Rullier, Bertrand Bertussi, Jean Yves Natoli, Laurent Servant, David Talaga

Proceedings Volume 5647, (2005) https://doi.org/10.1117/12.585248

KEYWORDS: Chromium, Silica, Absorption, Contamination, Laser induced damage, Atomic force microscopy, Particles, Laser optics, Optical components, Microscopes

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Proceedings Article | 10 June 2004 Paper

Laser-induced damage growth with small and large beams: comparison between laboratory experiments and large-scale laser data

Roger Courchinoux, Gerard Raze, Caroline Sudre, Michel Josse, Alain Boscheron, C. Lepage, Elizabeth Mazataud, Edouard Bordenave, Laurent Lamaignere, Marc Loiseau, Thierry Donval, Herve Bercegol

Proceedings Volume 5273, (2004) https://doi.org/10.1117/12.524844

KEYWORDS: Laser induced damage, Pulsed laser operation, Silica, Laser sources, Statistical analysis, Nd:YAG lasers, Polarizers, Microscopes, Motion controllers, Optical components

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Proceedings Article | 7 April 2004 Paper

Laser damage measurements on optics: from small to large beams, from samples to large aperture components

Laurent Lamaignere, Marc Loiseau, Roger Courchinoux, Gerard Raze, Caroline Sudre, Michel Josse, Thierry Donval, Herve Bercegol

Proceedings Volume 5478, (2004) https://doi.org/10.1117/12.558520

KEYWORDS: Laser induced damage, Optical testing, Statistical analysis, Optical components, High power lasers, Analytical research

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Proceedings Article | 26 February 2004 Paper

Automatic damage test benches: from samples to large-aperture optical components

Marc Loiseau, Laurent Lamaignere, Roger Courchinoux, Gerard Raze, Caroline Sudre, Michel Josse, Thierry Donval, Herve Bercegol

Proceedings Volume 5252, (2004) https://doi.org/10.1117/12.512939

KEYWORDS: Laser induced damage, Silica, Optical components, Crystals, High power lasers, Statistical analysis, Laser optics, Ultraviolet radiation, Optical testing, Mirrors

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Proceedings Article | 23 July 1999 Paper

LMJ target area design and engineering physics inside the LMJ target chamber

Daniel Schirmann, Luc Bianchi, Roger Courchinoux, Anne Fornier, Henry Jaquet, Francois Jequier, Alain Geille, Jean Gomme, Thierry Lonjaret

Proceedings Volume 3492, (1999) https://doi.org/10.1117/12.354185

KEYWORDS: X-rays, Fusion energy, Contamination, Ions, Boron, X-ray optics, Gold, Aluminum, Silica, Environmental sensing

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Showing 5 of 27 publications

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