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19 August 1996 Laser optical coatings with different reflectance profiles
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Graded reflectance coatings are typically identified with optical coatings having a gaussian reflectance profile along the surface with circular symmetry. Indeed the first use of such coatings was as output couplers of gaussian laser resonators, then also super-gaussian reflectance profiles were considered. The variation of reflectance along the surface is obtained in most cases by a coating thickness variation, with an appropriate choice of both coating structure and thickness profile it is possible to obtain any maximum reflectance and any spatial behavior of the reflectance itself. New reflectance profiles that seem to be of interest are: graded reflectances with a central minimum, that is high transmittance at the coating center, and non- monotonic radial reflectance profiles as for example high reflectance on an annular area of the optical component. In addition, coatings with non-circular symmetry appear useful for particular laser applications. The methods for obtaining such reflectance profiles are discussed.
© (1996) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Angela M. Piegari, Salvatore Scaglione, and Gabriele Emiliani "Laser optical coatings with different reflectance profiles", Proc. SPIE 2776, Developments in Optical Component Coatings, (19 August 1996);


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