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4 November 1994 Variable reflectivity mirrors for Nd:YAG (1.06 μm) and Er:YAG lasers (2.94 μm)
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Proceedings Volume 2253, Optical Interference Coatings; (1994)
Event: 1994 International Symposium on Optical Interference Coatings, 1994, Grenoble, France
Variable reflectivity mirrors (VRM) are dielectric thin film devices having a reflectivity profile due to a thickness variation of one or more layers. VRM for laser resonators operating at wavelengths 1.06 micrometers and 2.94 micrometers were fabricated by electron beam evaporation. A fixed-aperture-method was developed. With thin-films designs of the etalon-layer of single- layer type smooth supergaussian reflectivity profiles were obtained. Central reflectivities of up to 94% and apodising apertures were achieved. Laser damage measurements according to ISO 11254 were performed with four different thin film systems for VRM designed for 15-ns Q- switched pulses, which is comparable to results obtained from commercial uniform coatings. a less-sophisticated testing procedure was used for the 2940-nm VRM, resulting in a damage threshold)free-running) of 0.35 MW/cm2.
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Georg Bostanjoglo and Achim Bernhardt "Variable reflectivity mirrors for Nd:YAG (1.06 μm) and Er:YAG lasers (2.94 μm)", Proc. SPIE 2253, Optical Interference Coatings, (4 November 1994);

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