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Proceedings Paper

Laser damage measurement of thick silica plates using a new laser injection scheme
Author(s): D. Penninckx; R. Diaz; O. Bonville; R. Courchinoux; L. Lamaignère; J. Luce
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Paper Abstract

Some silica plates of high power nanosecond lasers may be a few centimeter thick for instance because they should sustain vacuum. Measuring laser-induced damage thresholds at the output surface of these thick silica plates is a complex task because non-linear laser propagation effects may occur inside the plate which prevents knowing accurately the fluence at the output. Two non-linear effects have to be considered: stimulated Brillouin scattering (SBS) and Kerr effect. SBS is mainly driven by the spectral power density of the pulses: if the spectral power density is below a threshold, SBS is negligible. Thus, spectral broadening is required. Kerr effect depends on the instantaneous intensity. Hence, a smooth temporal shape without overshoots is required. However, both conditions (wide spectrum and no overshoots) are impossible to fulfill with standard lasers. As a matter of fact, an injected laser has a smooth temporal profile but is spectrally narrow. Without injection, the laser is multimode yielding a wide spectrum but a chaotic temporal profile. We solved the problem by phase-modulating a continuous-wave seeder of our laser (patent pending). The phasemodulation frequency is adjusted to a multiple of the inverse of the round-trip time of the laser cavity. The laser pulses have a wide spectrum to suppress SBS and do not exhibit temporal overshoots to reduce Kerr effects. During the presentation, we will show the features of the laser pulses and laser-induced damage measurements of thick silica plates using this scheme.

Paper Details

Date Published: 22 July 2016
PDF: 6 pages
Proc. SPIE 9983, Pacific Rim Laser Damage 2016: Optical Materials for High-Power Lasers, 99830S (22 July 2016); doi: 10.1117/12.2235748
Show Author Affiliations
D. Penninckx, Commissariat à l'Énergie Atomique (France)
R. Diaz, Commissariat à l'Énergie Atomique (France)
O. Bonville, Commissariat à l'Énergie Atomique (France)
R. Courchinoux, Commissariat à l'Énergie Atomique (France)
L. Lamaignère, Commissariat à l'Énergie Atomique (France)
J. Luce, Commissariat à l'Énergie Atomique (France)

Published in SPIE Proceedings Vol. 9983:
Pacific Rim Laser Damage 2016: Optical Materials for High-Power Lasers
Takahisa Jitsuno; Jianda Shao; Wolfgang Rudolph, Editor(s)

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