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Proceedings Paper

Laser optical coatings with different reflectance profiles
Author(s): Angela M. Piegari; Salvatore Scaglione; Gabriele Emiliani
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Paper Abstract

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.

Paper Details

Date Published: 19 August 1996
PDF: 9 pages
Proc. SPIE 2776, Developments in Optical Component Coatings, (19 August 1996); doi: 10.1117/12.246842
Show Author Affiliations
Angela M. Piegari, ENEA (Italy)
Salvatore Scaglione, ENEA (Italy)
Gabriele Emiliani, ENEA (Italy)


Published in SPIE Proceedings Vol. 2776:
Developments in Optical Component Coatings
Ian Reid, Editor(s)

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