Influence of laser output parameters on film damage threshold

Rongrong Yan; Junhong Su; Jianle Zhao

doi:10.1117/12.2539368

8 July 2019 Influence of laser output parameters on film damage threshold

Rongrong Yan, Junhong Su, Jianle Zhao

Proceedings Volume 11063, Pacific Rim Laser Damage 2019: Optical Materials for High-Power Lasers; 110631G (2019) https://doi.org/10.1117/12.2539368
Event: Pacific Rim Laser Damage 2019 and Thin Film Physics and Applications 2019, 2019, Qingdao, China

Abstract

Optical film damage threshold is an important basis for measuring the ability of film to resist laser damage, and laser parameters are the key factors affecting its accurate measurement. The single-factor control variable method was used to establish the the numerical model of laser energy error, the focused spot size error and the damage threshold error, and the M ² factor and the damage threshold. The theoretical analysis and computer simulation of the energy error, the focused spot size error and the beam quality on the film damage threshold influences. A method based on the Shack-Hartman wave-front detection method is proposed to measure the pulsed laser beam parameters. The working principle is described in detail, and the Shack-Hartman beam shape parameter measurement system is designed. The actual output energy of the laser and the size of the focused spot were measured experimentally, and the uncertainty of the film damage threshold was evaluated according to the statistical principle. The results shows that the energy error and the focused spot error are directly proportional to the damage threshold error, and M ² is inversely related to the damage threshold. From the thin film sample analysis, the relative uncertainty of the damage threshold measurement is 18.78%. Therefore, studying the influence of laser parameters on the damage threshold provides a direction for obtaining accurate film damage threshold test results.

Citation Download Citation

Rongrong Yan, Junhong Su, and Jianle Zhao "Influence of laser output parameters on film damage threshold", Proc. SPIE 11063, Pacific Rim Laser Damage 2019: Optical Materials for High-Power Lasers, 110631G (8 July 2019); https://doi.org/10.1117/12.2539368

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KEYWORDS

Laser damage threshold

Error analysis

Laser energy

Microlens array

Wavefronts

Charge-coupled devices

Computer simulations

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