Thermal laser induced damage in optical coatings due to an incident pulse train

Ryan J. McGuigan; Helmut Kessler

doi:10.1117/12.2600793

19 November 2021 Thermal laser induced damage in optical coatings due to an incident pulse train

Ryan J. McGuigan, Helmut Kessler

Author Affiliations +

Proceedings Volume 11910, Laser-Induced Damage in Optical Materials 2021; 1191013 (2021) https://doi.org/10.1117/12.2600793
Event: SPIE Laser Damage, 2021, Online Only

Abstract

The temperature distribution of a slightly absorbing optical thin film atop a glass substrate subjected to a laser pulse train of pulse duration 1ns is derived from the classical heat equation. The critical fluence defined by the point at which thermal damage occurs is derived and the dependence of laser induced damage threshold (LIDT) on repetition rate, pulse duration, wavelength, thermal properties, beam and optic dimensions is discussed. A comparison is made between the theoretical LIDT and well known experimentally observed scaling laws for both Gaussian and ”Top-Hat” pulse profiles. It is found that the ratio of beam to optic diameter is an important parameter in LIDT determination. Larger substrates are found to have a lower LIDT and it is suggested that LIDT follows an inverse scaling rule with respect to repetition rate.

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Ryan J. McGuigan and Helmut Kessler "Thermal laser induced damage in optical coatings due to an incident pulse train", Proc. SPIE 11910, Laser-Induced Damage in Optical Materials 2021, 1191013 (19 November 2021); https://doi.org/10.1117/12.2600793

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