Share Email Print
cover

Proceedings Paper

Novel diffraction gratings for next generation spectrographs with high spectral dispersion
Author(s): N. Ebizuka; T. Okamoto; T. Hosobata; Y. Yamagata; M. Sasaki; M. Uomoto; T. Shimatsu; S. Sato; N. Hashimoto; I. Tanaka; T. Hattori; S. Ozaki; W. Aoki
Format Member Price Non-Member Price
PDF $14.40 $18.00
cover GOOD NEWS! Your organization subscribes to the SPIE Digital Library. You may be able to download this paper for free. Check Access

Paper Abstract

As a transmission grating, a surface-relief (SR) grating with sawtooth shaped ridges and volume phase holographic (VPH) grating are widely used for instruments of astronomical observations. However the SR grating is difficult to achieve high diffraction efficiency at high angular dispersion, and the VPH grating has low diffraction efficiency in high diffraction orders. We propose novel gratings that solve these problems. We introduce the hybrid grism which combines a high refractive index prism with a replicated transmission grating, which has sawtooth shaped ridges of an acute apex angle. The birefringence VPH (B-VPH) grating which contains an anisotropic medium, such as a liquid crystal, achieves diffraction efficiency up to 100% at the first diffraction order for natural polarization and for circular polarization. The quasi-Bragg (QB) grating which consists of long rectangular mirrors aligned in parallel precisely, like a window blind, achieves diffraction efficiency of 60% or more in higher than the 4th diffraction order. The volume binary (VB) grating with narrow grooves also achieves diffraction efficiency of 60% or more in higher than the 6th diffraction order. The reflector facet transmission (RFT) grating which is a SR grating with sawtooth shaped ridges of an acute apex angle achieves diffraction efficiency up to 80% in higher than the 4th diffraction order.

Paper Details

Date Published: 22 July 2016
PDF: 10 pages
Proc. SPIE 9912, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation II, 99122Z (22 July 2016); doi: 10.1117/12.2231949
Show Author Affiliations
N. Ebizuka, RIKEN (Japan)
T. Okamoto, RIKEN (Japan)
T. Hosobata, RIKEN (Japan)
Y. Yamagata, RIKEN (Japan)
M. Sasaki, Toyota Technological Institute (Japan)
M. Uomoto, Tohoku Univ. (Japan)
T. Shimatsu, Tohoku Univ. (Japan)
S. Sato, Citizen Holdings Co., Ltd. (Japan)
N. Hashimoto, Citizen Holdings Co., Ltd. (Japan)
I. Tanaka, National Astronomical Observatory of Japan (Japan)
T. Hattori, National Astronomical Observatory of Japan (Japan)
S. Ozaki, National Astronomical Observatory of Japan (Japan)
W. Aoki, National Astronomical Observatory of Japan (Japan)


Published in SPIE Proceedings Vol. 9912:
Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation II
Ramón Navarro; James H. Burge, Editor(s)

© SPIE. Terms of Use
Back to Top