9 August 2016 Optical design of the slit-viewing camera for the NIRSPEC upgrade
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Abstract
NIRSPEC is a 1-5 μm high- and medium-resolution echelle spectrograph for the Keck II telescope, delivered in 1999 by the UCLA Infrared Laboratory (PI: Ian McLean). The instrument will be upgraded to replace detectors and electronics in the spectrograph (SPEC) and slit-viewing camera (SCAM). The existing SCAM design is limited to the 1-2.5 μm regime and optimized for the PICNIC 256x256 40-μm-pixel array. The upgrade of the SCAM to a Teledyne H1RG 1024x1024 18-μm-pixel array will allow imaging of the slit from 1-5 μm, increasing observing efficiency in the L and M bands. The extension of SCAM’s wavelength coverage requires re-optimization of its optical design. We present a proof-of-concept optical design of the new SCAM, optimized for a replacement detector. We discuss lens choices, design constraints, and the addition of blocking filters to mitigate saturation issues related to the high background levels in the thermal infrared.
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Emily C. Martin, Michael P. Fitzgerald, Ian S. McLean, Evan Kress, Eric Wang, "Optical design of the slit-viewing camera for the NIRSPEC upgrade", Proc. SPIE 9908, Ground-based and Airborne Instrumentation for Astronomy VI, 99082R (9 August 2016); doi: 10.1117/12.2233767; https://doi.org/10.1117/12.2233767
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