Optimal design and fabrication of high dispersion VPH grism for Subaru Telescope

Masako Kashiwagi; Keiko Oka; Misako Irisawa; Noboru Ebizuka; Masanori Iye; Kashiko Kodate

doi:10.1117/12.551038

24 September 2004 Optimal design and fabrication of high-dispersion VPH grism for Subaru Telescope

Masako Kashiwagi, Keiko Oka, Misako Irisawa, Noboru Ebizuka, Masanori Iye, Kashiko Kodate

Proceedings Volume 5494, Optical Fabrication, Metrology, and Material Advancements for Telescopes; (2004) https://doi.org/10.1117/12.551038
Event: SPIE Astronomical Telescopes + Instrumentation, 2004, Glasgow, United Kingdom

Abstract

We fabricated a large size (110x106mm²) Volume Phase Holographic (VPH) grism which was extremely high efficiency and dispersion. In June 2003, the VPH grism with straight wavelength of 450nm and the resolution 2500, installed in Subaru telescope used for the Faint Object Camera And Spectroscopic (FOCAS) for a test observation. As a result of this performance assessment, it was verified that our optimal design and fabrication process was valid. Liquid photopolymer is used for VPH grating as photosensitive materials. We design the optimal parameters such as grating thickness and strength of the refractive index modulation, which is crucial in obtaining a well performing grism, by reference to Rigorous Coupled Wave Analysis (RCWA). Here, the optimal design and fabrication procedure, and the evaluation of high performance VPH grism (wavelength:520nm, resolution:3000, grating period:1μm) will be discussed.

Citation Download Citation

Masako Kashiwagi, Keiko Oka, Misako Irisawa, Noboru Ebizuka, Masanori Iye, and Kashiko Kodate "Optimal design and fabrication of high-dispersion VPH grism for Subaru Telescope", Proc. SPIE 5494, Optical Fabrication, Metrology, and Material Advancements for Telescopes, (24 September 2004); https://doi.org/10.1117/12.551038

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