Multiple-Pulse Laser-Induced Damage To Metal Mirror Surfaces

Yong Jee; Michael F Becker; Rodger M Walser

doi:10.1117/12.944450

27 June 1988 Multiple-Pulse Laser-Induced Damage To Metal Mirror Surfaces

Yong Jee, Michael F Becker, Rodger M Walser

Proceedings Volume 0895, Laser Optics for Intracavity and Extracavity Applications; (1988) https://doi.org/10.1117/12.944450
Event: 1988 Los Angeles Symposium: O-E/LASE '88, 1988, Los Angeles, CA, United States

Abstract

The accumulation dependence of damage and laser induced damage morphologies on single crystal metal surfaces have been observed under Q-switched 1064 nm Nd:YAG laser irradiation at 10 nsec pulses at a 10 Hz rate. Several different damage morphologies were observed: slip-line formation, ripple patterns, flat-melting, and boiling. Damage probability versus fluence curves and accumulation curves are plotted to investigate damage behavior as it correlates with morphology. Accumulation curves showed different damage behavior for crystals of different orientation. Threshold decrease due to accumulation was the largest on (111) Cu and Al surfaces, whidh also had the lowest single shot damage threshold. The threshold reduction in accumulation follows the equation F_N = F₁ N^S-1 where F_N is the N-pulse damage threshold, N the pulse number, and S the slope of the accumulation curve. Accumulation appears to be the result of the storage cycle of thermal stress-strain energy induced by each laser pulse, and multi-pulse damage results from plastic slip and fatigue.

Citation Download Citation

Yong Jee, Michael F Becker, and Rodger M Walser "Multiple-Pulse Laser-Induced Damage To Metal Mirror Surfaces", Proc. SPIE 0895, Laser Optics for Intracavity and Extracavity Applications, (27 June 1988); https://doi.org/10.1117/12.944450

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