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High dispersive and monolithic 100% efficiency grisms

: Reinhold, Jörg; Schulze, Marcel; Kley, Ernst-Bernhard; Tünnermann, Andreas

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Online im WWW, 2012, arXiv:1211.5260, 9 pp.
Electronic Publication
Fraunhofer IOF ()

We present a type of grism, a series combination of transmission grating and prism, in which we reduce the number of diffraction orders and achieve a configuration with very high angular dispersion. The grism can be fabricated from a single dielectric material and requires no metallic or dielectric film layers for high transmission diffraction efficiency. One can reach 100% in the -1st transmission diffraction order and the equal damage threshold as the dielectric bulk material. We realized such an element in fused silica with an efficiency of more then 99%. The bevel backside reflection is reduced by a statistical antireflective structure, so we measured an efficiency of the entire grism of 95% at a single wavelength.