Modeling of light intensification by conical pits within multilayer high reflector coatings

S. Roger Qiu; Justin E. Wolfe; Anthony M. Monterrosa; Michael D. Feit; Thomas V. Pistor; Christopher J. Stolz

doi:10.1117/12.836916

31 December 2009 Modeling of light intensification by conical pits within multilayer high reflector coatings

S. Roger Qiu, Justin E. Wolfe, Anthony M. Monterrosa, Michael D. Feit, Thomas V. Pistor, Christopher J. Stolz

Proceedings Volume 7504, Laser-Induced Damage in Optical Materials: 2009; 75040M (2009) https://doi.org/10.1117/12.836916
Event: Laser Damage Symposium XLI: Annual Symposium on Optical Materials for High Power Lasers, 2009, Boulder, Colorado, United States

Abstract

Removal of laser-induced damage sites provides a possible mitigation pathway to improve damage resistance of coated multilayer dielectric mirrors. In an effort to determine the optimal mitigation geometry which will not generate secondary damage precursors, the electric field distribution within the coating layers for a variety of mitigation shapes under different irradiation angles has been estimated using the finite difference time domain (FDTD) method. The coating consists of twenty-four alternating layers of hafnia and silica with a quarter-wave reflector design. A conical geometrical shape with different cone angles is investigated in the present study. Beam incident angles range from 0° to 60° at 5° increments. We find that light intensification (square of electric field, |E|²) within the multilayers depends strongly on the beam incident direction and the cone angle. By comparing the field intensification for each cone angle under all angles of incidence, we find that a 30° conical pit generates the least field intensification within the multilayer film. Our results suggest that conical pits with shallow cone angles (≤ 30°) can be used as potential optimal mitigation structures.

Citation Download Citation

S. Roger Qiu, Justin E. Wolfe, Anthony M. Monterrosa, Michael D. Feit, Thomas V. Pistor, and Christopher J. Stolz "Modeling of light intensification by conical pits within multilayer high reflector coatings", Proc. SPIE 7504, Laser-Induced Damage in Optical Materials: 2009, 75040M (31 December 2009); https://doi.org/10.1117/12.836916

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