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Proceedings Paper

Development of micro image slicer of integral field unit for spaceborne solar spectrograph
Author(s): Y. Suematsu; T. Sukegawa; Y. Okura; T. Nakayasu; Y. Enokida; M. Koyama; K. Saito; S. Ozaki; S. Tsuneta
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Paper Abstract

We present an innovative optical design for image slicer integral field unit (IFU) and manufacturing method which overcome optical limitation of metallic mirrors. Our IFU consists of micro image slicer of 45 arrayed highly-narrow flat metallic mirrors and a pseudo pupil mirror array of off-axis conic aspheres forming three pseudo slits of re-arranged slicer images. A prototype IFU demonstrates their optical quality high enough for a visible light spectrograph. The each slicer mirror is 1.58 mm in length and 30μm in width with surface roughness < 1 nm rms, edge sharpness < 0.1μm, etc. This IFU is small-sized and can be implemented in a multi-slit spectrograph without any moving mechanism and fore optics in which one slit is real and the others are of pseudo slits from the IFU. Those properties are well suitable for space-borne spectrograph to be aboard such as a next Japanese solar mission SOLAR-C.

Paper Details

Date Published: 28 July 2014
PDF: 12 pages
Proc. SPIE 9151, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation, 91511S (28 July 2014); doi: 10.1117/12.2054569
Show Author Affiliations
Y. Suematsu, National Astronomical Observatory of Japan (Japan)
T. Sukegawa, Canon Inc. (Japan)
Y. Okura, Canon Inc. (Japan)
T. Nakayasu, Canon Inc. (Japan)
Y. Enokida, Canon Inc. (Japan)
M. Koyama, Canon Inc. (Japan)
K. Saito, Canon Inc. (Japan)
S. Ozaki, National Astronomical Observatory of Japan (Japan)
S. Tsuneta, Japan Aerospace Exploration Agency (Japan)


Published in SPIE Proceedings Vol. 9151:
Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation
Ramón Navarro; Colin R. Cunningham; Allison A. Barto, Editor(s)

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