Laser damage initiation and growth of antireflection coated S-FAP crystal surfaces prepared by pitch lap and magnetorheological finishing

Christopher J. Stolz; Joseph A. Menapace; Kathleen I. Schaffers; Camille Bibeau; Michael D. Thomas; Andrew J. Griffin

doi:10.1117/12.638831

7 February 2006 Laser damage initiation and growth of antireflection coated S-FAP crystal surfaces prepared by pitch lap and magnetorheological finishing

Christopher J. Stolz, Joseph A. Menapace, Kathleen I. Schaffers, Camille Bibeau, Michael D. Thomas, Andrew J. Griffin

Author Affiliations +

Proceedings Volume 5991, Laser-Induced Damage in Optical Materials: 2005; 59911I (2006) https://doi.org/10.1117/12.638831
Event: Boulder Damage Symposium XXXVII: Annual Symposium on Optical Materials for High Power Lasers, 2005, Boulder, CO, United States

Abstract

Antireflection (AR) coatings typically damage at the interface between the substrate and coating. Therefore the substrate finishing technology can have an impact on the laser resistance of the coating. For this study, AR coatings were deposited on Yb:S-FAP [Yb³⁺:Sr₅(PO₄)₃F] crystals that received a final polish by both conventional pitch lap finishing as well as magnetorheological finishing (MRF). SEM images of the damage morphology reveals laser damage originates at scratches and at substrate coating interfacial absorbing defects. Previous damage stability tests on multilayer mirror coatings and bare surfaces revealed damage growth can occur at fluences below the initiation fluence. The results from this study suggest the opposite trend for AR coatings. Investigation of unstable HR and uncoated surface damage morphologies reveals significant radial cracking that is not apparent with AR damage due to AR delamination from the coated surface with few apparent cracks at the damage boundary. Damage stability tests show that coated Yb:S-FAP crystals can operate at 1057 nm at fluences around 20 J/cm² at 10 ns; almost twice the initiation damage threshold.

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Christopher J. Stolz, Joseph A. Menapace, Kathleen I. Schaffers, Camille Bibeau, Michael D. Thomas, and Andrew J. Griffin "Laser damage initiation and growth of antireflection coated S-FAP crystal surfaces prepared by pitch lap and magnetorheological finishing", Proc. SPIE 5991, Laser-Induced Damage in Optical Materials: 2005, 59911I (7 February 2006); https://doi.org/10.1117/12.638831

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