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11 September 2020 Derivation of spot profile and size requirements for the proposed US national damage standard
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This paper introduces and discusses two analyses key to the design of the proposed US National Standard test for laser damage. These two analyses give the derivation of the requirements on laser fluence profile and spot size. Each of these two design parameters are linked directly to the accuracy of the test. The role of the laser profile is discussed. Specifically, the seminal role of the flat-top profile in ensuring the accuracy of the test result is derived. The implied loss of accuracy and specificity of the test result when a Gaussian beam is used for the test is derived. The second key test design parameter is the spot size which affects the accuracy of the observed rate of damage. The accuracy of the observed rate as function of spot size is derived. Using this formulation rules for the selection of spot size and test length are given. Alternate strategies for observed damage rate corrections, so-called “dead time” corrections, are introduced and discussed.
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Jonathan W. Arenberg "Derivation of spot profile and size requirements for the proposed US national damage standard", Proc. SPIE 11514, Laser-induced Damage in Optical Materials 2020, 115141N (11 September 2020); https://doi.org/10.1117/12.2571880
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