Development of a dichroic beam splitter for Subaru AO188

Yosuke Minowa; Hideki Takami; Makoto Watanabe; Yutaka Hayano; Masaaki Miyake; Masanori Iye; Shin Oya; Masayuki Hattori; Naoshi Murakami; Olivier Guyon; Yoshihiko Saito; Meguru Itoh; Stephen Colley; Matthew Dinkins; Michael Eldred; Taras Golota

doi:10.1117/12.788597

15 July 2008 Development of a dichroic beam splitter for Subaru AO188

Yosuke Minowa, Hideki Takami, Makoto Watanabe, Yutaka Hayano, Masaaki Miyake, Masanori Iye, Shin Oya, Masayuki Hattori, Naoshi Murakami, Olivier Guyon, Yoshihiko Saito, Meguru Itoh, Stephen Colley, Matthew Dinkins, Michael Eldred, Taras Golota

Author Affiliations +

Proceedings Volume 7015, Adaptive Optics Systems; 701561 (2008) https://doi.org/10.1117/12.788597
Event: SPIE Astronomical Telescopes + Instrumentation, 2008, Marseille, France

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.

Citation Download Citation

Yosuke Minowa, Hideki Takami, Makoto Watanabe, Yutaka Hayano, Masaaki Miyake, Masanori Iye, Shin Oya, Masayuki Hattori, Naoshi Murakami, Olivier Guyon, Yoshihiko Saito, Meguru Itoh, Stephen Colley, Matthew Dinkins, Michael Eldred, and Taras Golota "Development of a dichroic beam splitter for Subaru AO188", Proc. SPIE 7015, Adaptive Optics Systems, 701561 (15 July 2008); https://doi.org/10.1117/12.788597

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available