Laser damage resistant multiband high reflective optics

Angela Q. Wang; Jue Wang; Michael J. D'lallo; Jim E Platten; Brian P. Roy; Michael Orr; Joseph C. Crifasi

doi:10.1117/12.2050739

24 June 2014 Laser damage resistant multiband high reflective optics

Angela Q. Wang, Jue Wang, Michael J. D'lallo, Jim E Platten, Brian P. Roy, Michael Orr, Joseph C. Crifasi

Proceedings Volume 9070, Infrared Technology and Applications XL; 90701B (2014) https://doi.org/10.1117/12.2050739
Event: SPIE Defense + Security, 2014, Baltimore, MD, United States

Abstract

Laser durable multiband high reflective optics can be realized by depositing densified HfO₂/SiO₂ multilayers on aluminum alloy substrates. To further understand the impact of surface finishing and cleaning on laser-induced damage of multiband high reflective optics, 1” diameter witness samples were characterized by means of spectrophotometry, atomic force microscopy, confocal laser scanning microscopy, white light interferometry, scanning electron microscopy, and laser-induced damage threshold tests performed at 1064 nm, 20 ns, 20 Hz, and near normal angle of incidence. Laser-induced damage thresholds of 12.5 J/cm² and 47 J/cm² were obtained on a stained witness and unstained witness, respectively. A two-step laser damage process was proposed based on the post-damage analysis. The results suggest that nodule defects are the limiting factor for laser-induced damage thresholds. There exists the potential in aluminum-based dielectric coated multiband reflective optics for extremely high power laser applications.

Citation Download Citation

Angela Q. Wang, Jue Wang, Michael J. D'lallo, Jim E Platten, Brian P. Roy, Michael Orr, and Joseph C. Crifasi "Laser damage resistant multiband high reflective optics", Proc. SPIE 9070, Infrared Technology and Applications XL, 90701B (24 June 2014); https://doi.org/10.1117/12.2050739

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