Optical design of the slit-viewing camera for the NIRSPEC upgrade

Emily C. Martin; Michael P. Fitzgerald; Ian S. McLean; Evan Kress; Eric Wang

doi:10.1117/12.2233767

9 August 2016 Optical design of the slit-viewing camera for the NIRSPEC upgrade

Emily C. Martin, Michael P. Fitzgerald, Ian S. McLean, Evan Kress, Eric Wang

Author Affiliations +

Proceedings Volume 9908, Ground-based and Airborne Instrumentation for Astronomy VI; 99082R (2016) https://doi.org/10.1117/12.2233767
Event: SPIE Astronomical Telescopes + Instrumentation, 2016, Edinburgh, United Kingdom

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, Emily C. Martin, Michael P. Fitzgerald, Michael P. Fitzgerald, Ian S. McLean, Ian S. McLean, Evan Kress, Evan Kress, Eric Wang, 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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