28 July 1994 High-power 1.315-μm laser test of multilayer mirrors
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A series of multilayer mirrors was exposed to a high power laser to measure absorption of the coatings and to test for thermal distortion. A high power chemical oxygen iodine laser with a wavelength of 1.315 micrometers was used to irradiate a variety of high reflectivity mirrors. The mirror coatings were multilayers of Ta2O5/SiO2 and Si3N4/SiO2 as well as aluminum enhanced with Nb2O5/SiO2. The dielectric layers were deposited by modulated reactive-dc-magnetron sputtering on fused silica substrates. The coated samples were placed in a vacuum chamber and monitored with a thermal imaging camera and an interferometer during irradiation. Absorption levels as low as 10 ppm were observed and the maximum distortion of the wave front was less than (lambda) /10 at 0.633 micrometers for the best parts.
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Bradley J. Pond, Bradley J. Pond, Tu Du, Tu Du, S. Talley, S. Talley, Charles K. Carniglia, Charles K. Carniglia, Jim J. McNally, Jim J. McNally, Gerald B. Charlton, Gerald B. Charlton, } "High-power 1.315-μm laser test of multilayer mirrors", Proc. SPIE 2114, Laser-Induced Damage in Optical Materials: 1993, (28 July 1994); doi: 10.1117/12.180924; https://doi.org/10.1117/12.180924

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