Direct comparison of laser-induced damage threshold testing protocols on dielectric mirrors: effect of nanosecond laser pulse shape at NIR and UV wavelengths

Rūta Pakalnytė; Egidijus Pupka; Andrius Melninkaitis

doi:10.1117/12.2536456

17 December 2019 Direct comparison of laser-induced damage threshold testing protocols on dielectric mirrors: effect of nanosecond laser pulse shape at NIR and UV wavelengths

Rūta Pakalnytė, Egidijus Pupka, Andrius Melninkaitis

Author Affiliations +

Proceedings Volume 11173, Laser-induced Damage in Optical Materials 2019; 1117318 (2019) https://doi.org/10.1117/12.2536456
Event: SPIE Laser Damage, 2019, Broomfield (Boulder area), Colorado, United States

Abstract

As a rule of thumb, laser-induced damage threshold (LIDT) is often reported in terms of a single number, without even mentioning the testing details. However, meaning of reported LIDT numbers could be different depending on the testing protocol used. Such differences are not always obvious to practitioners that are designing or building laser systems (users of LIDT numbers). Furthermore, the properties of laser sources used for LIDT testing could also be very different among various testing laboratories. Thus, in order to exemplify possible effects of LIDT testing details on reported values an experimental study is conducted, where direct comparison of the most popular testing protocols, namely 1-on-1, S-on-1, R-on-1, and Raster Scan, is made. Experiments were organized in such a way that all the tests for the wavelength of interest were done on the same sample (conventional high-reflectivity HR mirror) by using both injection-seeded pulses (single longitudinal mode) as well as non-seeded (multimode) pulses with comparable effective pulse duration. Two sufficiently large dielectric mirrors were tested. Experiments were conducted for fundamental- (1064 nm) and third- (355 nm) harmonic wavelengths of Nd:YAG laser. The LIDTs obtained by using distinct testing protocols as well as pertinent damage morphologies are directly compared and discussed.

Citation Download Citation

Rūta Pakalnytė, Egidijus Pupka, and Andrius Melninkaitis "Direct comparison of laser-induced damage threshold testing protocols on dielectric mirrors: effect of nanosecond laser pulse shape at NIR and UV wavelengths", Proc. SPIE 11173, Laser-induced Damage in Optical Materials 2019, 1117318 (17 December 2019); https://doi.org/10.1117/12.2536456

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KEYWORDS

Laser induced damage

Ultraviolet radiation

Laser damage threshold

Dielectric mirrors

Pulsed laser operation

Optical coatings

Q switched lasers

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