Laser conditioning of UV anti-reflective optical coatings for applications in aerospace

Nils Bartels; Paul Allenspacher; Wolfgang Riede

doi:10.1117/12.2326782

16 November 2018 Laser conditioning of UV anti-reflective optical coatings for applications in aerospace

Nils Bartels, Paul Allenspacher, Wolfgang Riede

Proceedings Volume 10805, Laser-Induced Damage in Optical Materials 2018: 50th Anniversary Conference; 108051Q (2018) https://doi.org/10.1117/12.2326782
Event: SPIE Laser Damage, 2018, Boulder, Colorado, United States

Abstract

In this work we study the effect of laser conditioning on laser-induced damage of ion-beam sputtered, anti-reflection coated laser optics with ns-pulsed laser radiation at a wavelength of 355 nm. With respect to applications in aerospace, measurements were performed under high vacuum. At laser fluences below 20 J/cm², laser-induced damage appears as pin-point damage (small explosion pits with sizes in the range of 1 μm), sometimes referred to as "grey haze". We find that ramped laser conditioning is an effective tool to reduce not only the abundance but also the average size of pin-point damage at laser fluences exceeding the optic’s unconditioned laser-induced damage threshold. We discuss our results in the context of the small absorber model for damage crater formation.

Citation Download Citation

Nils Bartels, Paul Allenspacher, and Wolfgang Riede "Laser conditioning of UV anti-reflective optical coatings for applications in aerospace", Proc. SPIE 10805, Laser-Induced Damage in Optical Materials 2018: 50th Anniversary Conference, 108051Q (16 November 2018); https://doi.org/10.1117/12.2326782

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