Absorptance Behavior of Optical Coatings for High-Average-Power Laser Applications
Applied Optics, Vol. 39, Issue 4, pp. 650-658 (2000)
http://dx.doi.org/10.1364/AO.39.000650
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Abstract
A modified photothermal deformation technique is used to measure the absorptance behaviors of optical multilayered dielectric coatings for a high-power laser system. The surface thermal-lensing modification uses an enlarged probe beam to facilitate alignment of the laser beam and data acquisition. The coatings, both reflective and transmissive types, are made by a physical vapor-deposition process. Coating absorptances are observed to depend on the laser’s exposure time and power density. Time-dependent absorptance defect models are proposed. Also, micrometer-sized sites of high absorptance and an area with physical damage can be found during the spatial scans. It is proposed that absorptance values reported for coatings in high-repetition-rate or cw-laser systems include time- and power-dependent behaviors in addition to other relevant irradiation parameters.
© 2000 Optical Society of America
[Optical Society of America ]
OCIS Codes
(120.4290) Instrumentation, measurement, and metrology : Nondestructive testing
(120.4630) Instrumentation, measurement, and metrology : Optical inspection
(160.4760) Materials : Optical properties
(240.0310) Optics at surfaces : Thin films
(300.1030) Spectroscopy : Absorption
(310.6860) Thin films : Thin films, optical properties
Citation
Robert Chow, John R. Taylor, and Zhou Ling Wu, "Absorptance Behavior of Optical Coatings for High-Average-Power Laser Applications," Appl. Opt. 39, 650-658 (2000)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-39-4-650
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