Performance of the near-infrared camera for the Subaru Prime Focus Spectrograph

Stephen A. Smee; James E. Gunn; Robert H. Barkhouser; Josh Peebles; Craig P. Loomis; Kjetil Dohlen; Erin Kado-Fong; Jahmour J. Givans; Mirek Golebiowski; Aidan Gray; Randy P. Hammond; Stephen C. Hope; Robert Lupton; Yuki Moritani; Naoyuki Tamura

doi:10.1117/12.2630536

29 August 2022 Performance of the near-infrared camera for the Subaru Prime Focus Spectrograph

Stephen A. Smee, James E. Gunn, Robert H. Barkhouser, Josh Peebles, Craig P. Loomis, Kjetil Dohlen, Erin Kado-Fong, Jahmour J. Givans, Mirek Golebiowski, Aidan Gray, Randy P. Hammond, Stephen C. Hope, Robert Lupton, Yuki Moritani, Naoyuki Tamura

Author Affiliations +

Proceedings Volume 12184, Ground-based and Airborne Instrumentation for Astronomy IX; 121847L (2022) https://doi.org/10.1117/12.2630536
Event: SPIE Astronomical Telescopes + Instrumentation, 2022, Montréal, Québec, Canada

Conference Poster

Abstract

This paper presents thermal system and imaging performance test results from the first of four near infrared cameras for the SuMIRe (Subaru Measurement of Images and Redshifts) Prime Focus Spectrograph (PFS) being developed for the Subaru Telescope. The PFS near infrared camera is a large (330 mm entrance aperture to accommodate a 275 mm collimated beam diameter) cryogenically cooled vacuum Schmidt camera with a 300 mm focal length that images dispersed light onto a 4k x 4k, 15 µm pixel, HgCdTe substrate-removed Teledyne 1.7 µm detector. The 230 kg camera contains just four optical elements: a two-element refractive corrector, a Mangin mirror, and a field flattening lens. This simple optical design produces good imaging performance considering the wide field and wavelength range, and it does so in large part due to the use of a Mangin mirror for the Schmidt primary. Thermal background, both in-band and out-of-band, is reduced to a scientifically acceptable level using cryogenically cooled optics, very black geometrically optimized baffling, and a pair of thermal rejection coatings that reject photons between the edge of the science bandpass and the detector cutoff. System operating temperature is achieved by a pair of closed-cycle cryocoolers, one dedicated to cooling the optics, and one dedicated to cooling the detector. Here we discuss the lab performance of the near infrared camera, both from the perspective of the thermal system and the optical system, including in-band and out-of-band performance.

Citation Download Citation

Stephen A. Smee, James E. Gunn, Robert H. Barkhouser, Josh Peebles, Craig P. Loomis, Kjetil Dohlen, Erin Kado-Fong, Jahmour J. Givans, Mirek Golebiowski, Aidan Gray, Randy P. Hammond, Stephen C. Hope, Robert Lupton, Yuki Moritani, and Naoyuki Tamura "Performance of the near-infrared camera for the Subaru Prime Focus Spectrograph", Proc. SPIE 12184, Ground-based and Airborne Instrumentation for Astronomy IX, 121847L (29 August 2022); https://doi.org/10.1117/12.2630536

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