355 nm and 1064 nm-pulse mixing to identify the laser-induced damage mechanisms in KDP

Stéphane Reyné; Guillaume Duchateau; Jean-Yves Natoli; Laurent Lamaignère

doi:10.1117/12.872855

21 February 2011 355 nm and 1064 nm-pulse mixing to identify the laser-induced damage mechanisms in KDP

Stéphane Reyné, Guillaume Duchateau, Jean-Yves Natoli, Laurent Lamaignère

Proceedings Volume 7937, Ultrafast Phenomena in Semiconductors and Nanostructure Materials XV; 79370L (2011) https://doi.org/10.1117/12.872855
Event: SPIE OPTO, 2011, San Francisco, California, United States

Abstract

Nanosecond laser-induced damage (LID) in potassium dihydrogen phosphate (KH₂PO₄ or KDP) remains an issue for light-frequency converters in large-aperture lasers such as NIF (National Ignition Facility, in USA) and LMJ (Laser MegaJoule, in France). In the final optic assembly, converters are simultaneously illuminated by multiple wavelengths during the frequency conversion. In this configuration, the damage resistance of the KDP crystals becomes a crucial problem and has to be improved. In this study, we propose a refined investigation about the LID mechanisms involved in the case of a multiple wavelengths combination. Experiments based on an original pump-pump set-up have been carried out in the nanosecond regime on a KDP crystal. In particular, the impact of a simultaneous mixing of 355 nm and 1064 nm pulses has been experimentally studied and compared to a model based on heat transfer, the Mie theory and a Drude model. This study sheds light on the physical processes implied in the KDP laser damage. In particular, a three-photon ionization mechanism is shown to be responsible for laser damage in KDP.

Citation Download Citation

Stéphane Reyné, Guillaume Duchateau, Jean-Yves Natoli, and Laurent Lamaignère "355 nm and 1064 nm-pulse mixing to identify the laser-induced damage mechanisms in KDP", Proc. SPIE 7937, Ultrafast Phenomena in Semiconductors and Nanostructure Materials XV, 79370L (21 February 2011); https://doi.org/10.1117/12.872855

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