7 August 2014 Curved VPH gratings for novel spectrographs
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Abstract
The introduction of volume phase holographic (VPH) gratings into astronomy over a decade ago opened new possibilities for instrument designers. In this paper we describe an extension of VPH grating technology that will have applications in astronomy and beyond: curved VPH gratings. These devices can disperse light while simultaneously correcting aberrations. We have designed and manufactured two different kinds of convex VPH grating prototypes for use in off-axis reflecting spectrographs. One type functions in transmission and the other in reflection, enabling Offnerstyle spectrographs with the high-efficiency and low-cost advantages of VPH gratings. We will discuss the design process and the tools required for modelling these gratings along with the recording layout and process steps required to fabricate them. We will present performance data for the first convex VPH grating produced for an astronomical spectrograph.
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J. Christopher Clemens, J. Christopher Clemens, Darragh O'Donoghue, Darragh O'Donoghue, Bart H. Dunlap, Bart H. Dunlap, } "Curved VPH gratings for novel spectrographs", Proc. SPIE 9151, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation, 91511K (7 August 2014); doi: 10.1117/12.2055585; https://doi.org/10.1117/12.2055585
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