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Proceedings Paper

Development of a dichroic beam splitter for Subaru AO188
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Paper Abstract

We have developed a dichroic beam splitter for the Subaru AO188, which reflects optical light (0.4-0.9 &mgr;m) for wavefront sensing and transmits near-infrared light (0.93-5.2 &mgr;m) for science observations. The beam splitter is made of 145mm × 200mm calcium fluoride substrate coated by fluoride and metal chalcogen compound multilayer, which should be a best way to realize high transmittance over wide wavelength range in the near infrared. However, since typical fluoride soft coating is less resistant to the moisture in the air, the fluoride coating become damaged as we use on the AO188 optical bench which is placed in the room temperature condition. We have performed several accelerated endurance tests of the beam splitter under high-humidity condition by changing the design of the coatings, and found an optimal solution with an oxide protection layer which prevents the damage of the dichroic coating and keeps high transmittance at near-infrared wavelength. In this paper, we report the results of the endurance tests and the performance of our dichroic beam splitter.

Paper Details

Date Published: 15 July 2008
PDF: 8 pages
Proc. SPIE 7015, Adaptive Optics Systems, 701561 (15 July 2008); doi: 10.1117/12.788597
Show Author Affiliations
Yosuke Minowa, National Astronomical Observatory of Japan/Subaru Telescope (United States)
Hideki Takami, National Astronomical Observatory of Japan/Subaru Telescope (United States)
Makoto Watanabe, National Astronomical Observatory of Japan/Subaru Telescope (United States)
Yutaka Hayano, National Astronomical Observatory of Japan/Subaru Telescope (United States)
Masaaki Miyake, Optical Coatings Japan Co., Ltd. (Japan)
Masanori Iye, National Astronomical Observatory of Japan (Japan)
Shin Oya, National Astronomical Observatory of Japan/Subaru Telescope (United States)
Masayuki Hattori, National Astronomical Observatory of Japan/Subaru Telescope (United States)
Naoshi Murakami, National Astronomical Observatory of Japan (Japan)
Olivier Guyon, National Astronomical Observatory of Japan/Subaru Telescope (United States)
Yoshihiko Saito, National Astronomical Observatory of Japan/Subaru Telescope (United States)
Meguru Itoh, National Astronomical Observatory of Japan/Subaru Telescope (United States)
Stephen Colley, National Astronomical Observatory of Japan/Subaru Telescope (United States)
Matthew Dinkins, National Astronomical Observatory of Japan/Subaru Telescope (United States)
Michael Eldred, National Astronomical Observatory of Japan/Subaru Telescope (United States)
Taras Golota, National Astronomical Observatory of Japan/Subaru Telescope (United States)


Published in SPIE Proceedings Vol. 7015:
Adaptive Optics Systems
Norbert Hubin; Claire E. Max; Peter L. Wizinowich, Editor(s)

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