15 May 2017 Test of VPHGS in SHSG for use at cryogenic temperatures
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Abstract
Silver halide sensitized gelatin (SHSG) processes are interesting because they combine the spectral and energetic sensitivity of a photographic emulsions with good optical quality and high diffraction efficiency of dichromate gelatin (DCG). Previous papers had been demonstrated that it is possible to obtain diffraction efficiencies near to 90% with Agfa- Gevaert plates and Colour Holographic plates in SHSG transmission gratings.

In this communication, we report on the performances measured at room temperature and in cryogenic conditions of a set of volume phase holographic gratings(VPHGs) manufactured with SHSG process aimed at their use in astronomical instrumentations. Two set of diffraction gratings has been manufactured using different processing. The first with SHSG process and the second with typical bleached process (developed with AAC and bleached in R-10).

In both cases the plate was BB640, ultrafine grain emulsions with a nominal thickness of 9 μm. The recording was performed with asymmetric geometry a 30° degrees between the light beams of wavelength 632.8 nm (He-Ne laser), which give a raise a spectral frequency of 800 l/m. The exposure was between 46 to 2048 μJ/cm2.

The results give us information about Bragg plane modification and reduction of diffraction efficiency when we introduced the VPHG to 77° K. In the case of SHSG process the final diffraction efficiency after cryogenic temperature are better at some exposure energy than previous measurements at room temperature. This experimental result give us possibilities to applied SHSG process in Astrophysics applications.
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Maider Insaustia, Francisco Garzón, P. Mas-Abellán, R. Madrigal, A. Fimia, "Test of VPHGS in SHSG for use at cryogenic temperatures", Proc. SPIE 10233, Holography: Advances and Modern Trends V, 102331C (15 May 2017); doi: 10.1117/12.2266943; https://doi.org/10.1117/12.2266943
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