Multithreshold Measurement and Analysis of Pulsed Laser Damage on Optical Surfaces
NAVAL WEAPONS CENTER CHINA LAKE CA
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The methodology of multithreshold analysis, a new approach to laser-damage research, is described. The comparison of thresholds for various damage-related effects identifies dominant failure mechanisms and provides better guidance for laser-materials technology. After a brief description of apparatus, the procedure for routinely measuring up to eight different thresholds per sample is given. The maximum-likelihood principle is used to derive an algorithm for computing thresholds and standard deviations. The use of a standard gold sample to verify reproducibility and to maintain long-term calibration is discussed. Examples of multithreshold results on uncoated and coated infrared optical components are presented. The following are some of the effects for which thresholds are compared slip, roughening, cracking, pits, melting, craters, delamination of coatings, ion and light emission, and work function change.
- Lasers and Masers