Defect insensitive 100 J/cm2 multilayer mirror coating process

Christopher J. Stolz; Justin E. Wolfe; Paul B. Mirkarimi; James A. Folta; John J. Adams; Marlon G. Menor; Nick E. Teslich; Regina Soufli; Carmen S. Menoni; Dinesh Patel

doi:10.1117/12.2030477

3 December 2013 Defect insensitive 100 J/cm₂ multilayer mirror coating process

Christopher J. Stolz, Justin E. Wolfe, Paul B. Mirkarimi, James A. Folta, John J. Adams, Marlon G. Menor, Nick E. Teslich, Regina Soufli, Carmen S. Menoni, Dinesh Patel

Author Affiliations +

Proceedings Volume 8885, Laser-Induced Damage in Optical Materials: 2013; 888502 (2013) https://doi.org/10.1117/12.2030477
Event: SPIE Laser Damage, 2013, Boulder, Colorado, United States

Abstract

Multilayer mirrors are fluence-limited by nodular defects. Such defects originate from the deposition source, inadequate cleaning, transport, pump down, heating, shedding from rotating hardware, etc. These overcoated inclusions behave as micro-lenses resulting in light intensification within the multilayer structure. To minimize the impact of these defects, a planarization process has been developed to reduce geometric-induced light intensification. By exploiting the angledependent etching rate of materials, a deposit-and-etch process reduces nodular defect height and diameter. Planarized defects demonstrate a greater than 20x increase in laser resistance at a wavelength of 1064 nm and pulse length of 10 ns. Process parameters were explored such as planarization efficiency of the coating materials, discrete versus continuous etching, thick planarization layers for substrate defects, and etching throughout the multilayer to planarize coating defects.

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Christopher J. Stolz, Justin E. Wolfe, Paul B. Mirkarimi, James A. Folta, John J. Adams, Marlon G. Menor, Nick E. Teslich, Regina Soufli, Carmen S. Menoni, and Dinesh Patel "Defect insensitive 100 J/cm₂ multilayer mirror coating process", Proc. SPIE 8885, Laser-Induced Damage in Optical Materials: 2013, 888502 (3 December 2013); https://doi.org/10.1117/12.2030477

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