9 August 2016 Design and modeling of a moderate-resolution astronomic spectrograph with volume-phase holographic gratings
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Abstract
We present an optical design of astronomic spectrograph based on a cascade of volume-phase holographic gratings. The cascade consists of three gratings. Each of them provides moderately high spectral resolution in a narrow range of 83nm. Thus the spectrum image represents three lines covering region 430-680nm. Two versions of the scheme are described: a full-scale one with estimated resolving power of 5300-7900 and a small-sized one intended for creation of a lab prototype, which provides the resolving power of 1500-3000. Diffraction efficiency modeling confirms that the system throughput can reach 75%, while stray light caused by the gratings crosstalk is negligible. We also propose a design of image slicer and focal reducer allowing to couple the instrument with a 6m-telescope. Finally, we present concept of the instrument’s optomechanical design.
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Eduard R. Muslimov, Eduard R. Muslimov, Gennady G. Valyavin, Gennady G. Valyavin, Sergey N. Fabrika, Sergey N. Fabrika, Nadezhda K. Pavlycheva, Nadezhda K. Pavlycheva, "Design and modeling of a moderate-resolution astronomic spectrograph with volume-phase holographic gratings", Proc. SPIE 9908, Ground-based and Airborne Instrumentation for Astronomy VI, 990842 (9 August 2016); doi: 10.1117/12.2231985; https://doi.org/10.1117/12.2231985
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