Mitigation of laser damage on fused silica surfaces with a variable profile CO2 laser beam

Annelise During; Philippe Bouchut; Jean-Guillaume Coutard; Christophe Leymarie; Hervé Bercegol

doi:10.1117/12.695446

15 January 2007 Mitigation of laser damage on fused silica surfaces with a variable profile CO₂ laser beam

Annelise During, Philippe Bouchut, Jean-Guillaume Coutard, Christophe Leymarie, Hervé Bercegol

Proceedings Volume 6403, Laser-Induced Damage in Optical Materials: 2006; 640323 (2007) https://doi.org/10.1117/12.695446
Event: Boulder Damage Symposium XXXVIII: Annual Symposium on Optical Materials for High Power Lasers, 2006, Boulder, Colorado, United States

Abstract

Laser damage at 3ω, 351 nm, of fused silica optical components is a major concern for LMJ maintenance. Indeed, even a low density of damage sites is unacceptable due to the exponential growth of surface damage with a series of laser shots. A technique is now used to prevent the growth of initiated damage sites : this mitigation technique consists in a local melting and evaporation of silica by CO₂ laser irradiation on the damage site. Even if the growth is stopped in most cases, we showed previously that some of the mitigated sites re-initiate on their peripheral area, where most of redeposited debris are located. To further increase the efficiency of mitigation technique, the treatment was improved by varying the spatial profile of the CO₂ laser beam. We present here the new set-up and the results obtained in terms of laser damage resistance: about 98% of the mitigated sites sustained 200 shots of a 10 J/cm² 3ω YAG laser without damage.

Citation Download Citation

Annelise During, Philippe Bouchut, Jean-Guillaume Coutard, Christophe Leymarie, and Hervé Bercegol "Mitigation of laser damage on fused silica surfaces with a variable profile CO₂ laser beam", Proc. SPIE 6403, Laser-Induced Damage in Optical Materials: 2006, 640323 (15 January 2007); https://doi.org/10.1117/12.695446

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available