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Proceedings Paper

A monolithic deformable mirror with latchable mechanical actuation (LATCHAMAN) for space-borne telescopes
Author(s): Keigo Enya; Hirokazu Kataza; Mitsuhiro Fukushima; Kenji Mitsui; Norio Okada; Hikaru Iwashita; Kanae Haze; Aoi Takahashi; Takayuki Kotani; Tomoyasu Yamamuro; Hitomi Kobayashi
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Paper Abstract

We present the concept, design, fabrication, and evaluation of a new deformable mirror (DM), which is latchable, compact, and designed to be applicable for cryogenic environments. The main body of a prototype DM was fabricated from a monolithic cuboid of aluminum using wire electrical discharge machining (EDM). A flexible structure was constructed inside the block by 3-dimensionally crossed hollowing using the EDM. The prototype has 6 × 6 channels, and its volume is 27 mm × 27 mm × 30 mm. The mirror was formed on the surface of the aluminum block using a highprecision NC lathe. The surface figure of the mirror was evaluated and 34 nm rms was obtained. The evaluated surface roughness for the center and off-center areas of the mirror was 9.2 nm rms and 7.6 nm rms, respectively Screws set at the back of the block deform the mirror via springs and the internal flexible structure. We present our first demonstration of deformation of the mirror carried out at ambient temperature. The relationship between the displacement of the screws and the deformation of the mirror was evaluated. Consequently, a linear relationship was confirmed, and no significant hysteresis was found. The application of such mirrors to telescopes used for various different objectives is discussed. We conclude that a DM based on our concept can be used for wavefront correction of space-borne telescopes, especially in the infrared wavelength region.

Paper Details

Date Published: 12 September 2014
PDF: 9 pages
Proc. SPIE 9219, Infrared Remote Sensing and Instrumentation XXII, 92190P (12 September 2014); doi: 10.1117/12.2075454
Show Author Affiliations
Keigo Enya, Japan Aerospace Exploration Agency (Japan)
Hirokazu Kataza, Japan Aerospace Exploration Agency (Japan)
Mitsuhiro Fukushima, National Astronomical Observatory of Japan (Japan)
Kenji Mitsui, National Astronomical Observatory of Japan (Japan)
Norio Okada, National Astronomical Observatory of Japan (Japan)
Hikaru Iwashita, National Astronomical Observatory of Japan (Japan)
Kanae Haze, Japan Aerospace Exploration Agency (Japan)
Aoi Takahashi, Japan Aerospace Exploration Agency (Japan)
Takayuki Kotani, National Astronomical Observatory of Japan (Japan)
Tomoyasu Yamamuro, OptCraft (Japan)
Hitomi Kobayashi, Kyoto Sangyo Univ. (Japan)
LLP Kyoto NijiKoubou (Japan)

Published in SPIE Proceedings Vol. 9219:
Infrared Remote Sensing and Instrumentation XXII
Marija Strojnik Scholl; Gonzalo Páez, Editor(s)

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