Characterization of micron scale periodic fluence variation and its possible impact on laser damage

Isaac Bass; Eyal Feigenbaum; Jim Vickers; Gabe Guss; Wren Carr

doi:10.1117/12.2685137

24 November 2023 Characterization of micron scale periodic fluence variation and its possible impact on laser damage

Isaac Bass, Eyal Feigenbaum, Jim Vickers, Gabe Guss, Wren Carr

Proceedings Volume 12726, Laser-Induced Damage in Optical Materials 2023; 127260C (2023) https://doi.org/10.1117/12.2685137
Event: SPIE Laser Damage, 2023, Dublin/Livermore, California, United States

Abstract

Cones machined into the surface of the final fused silica optics on the NIF have been used to remove laser induced damage from exposure to high fluence 351 nm laser light. When applied to the input surface of an optic, a shadow is created on the exit surface due to the divergence of the laser light by the cone walls. In recent years input surface cones have been utilized to shadow exit surface damage and thus arrest its continued growth. The expanding waves from the cone walls interfere with the incident beam to create a high fluence intensification at the exit surface. This intensification has the characteristic periodic spatial variation on a scale of the order of the 351 nm wavelength. The question arises as to how the damage density probability, ρ(Φ), is affected by this variation as compared to a uniform fluence. Does it follow the local periodic variation, or is it averaged over that variation. We consider both cases, how it can be predicted by direct measurement of the intensification as opposed to costly damage tests, and how we might measure the effect directly.

Conference Presentation

(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Isaac Bass, Eyal Feigenbaum, Jim Vickers, Gabe Guss, and Wren Carr "Characterization of micron scale periodic fluence variation and its possible impact on laser damage", Proc. SPIE 12726, Laser-Induced Damage in Optical Materials 2023, 127260C (24 November 2023); https://doi.org/10.1117/12.2685137

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