The near infrared camera for the Subaru Prime Focus Spectrograph
Stephen A. Smee, James E. Gunn, Mirek Golebiowski, Robert Barkhouser,, Sebastien Vives, Sandrine Pascal, Michael Carr, Stephen C. Hope, Craig, Loomis, Murdock Hart, Hajime Sugai, Naoyuki Tamura, Atsushi Shimono

TL;DR
This paper details the design of a near infrared camera for the Subaru Prime Focus Spectrograph, enabling simultaneous spectral observations of nearly 2400 objects across a broad wavelength range with high imaging performance.
Contribution
It introduces a simple, effective optical design for the NIR camera using a Mangin mirror and dichroic, optimized for wide field and wavelength coverage in a large, lightweight instrument.
Findings
Successful integration of a 4k x 4k HgCdTe detector for NIR imaging.
Achieved high image quality with a compact, four-element optical design.
Thermal rejection features effectively reduce out-of-band radiation.
Abstract
We present the detailed design of the near infrared camera for the SuMIRe (Subaru Measurement of Images and Redshifts) Prime Focus Spectrograph (PFS) being developed for the Subaru Telescope. The PFS spectrograph is designed to collect spectra from 2394 objects simultaneously, covering wavelengths that extend from 380 nm - 1.26 um. The spectrograph is comprised of four identical spectrograph modules, with each module collecting roughly 600 spectra from a robotic fiber positioner at the telescope prime focus. Each spectrograph module will have two visible channels covering wavelength ranges 380 nm - 640 nm and 640 nm - 955 nm, and one near infrared (NIR) channel with a wavelength range 955 nm - 1.26 um. Dispersed light in each channel is imaged by a 300 mm focal length, f/1.07, vacuum Schmidt camera onto a 4k x 4k, 15 um pixel, detector format. For the NIR channel a HgCdTe…
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