Optical characterization and testbed development for μ-Spec integrated spectrometers

Maryam Rahmani; Alyssa Barlis; Emily M. Barrentine; Ari D. Brown; Berhanu T. Bulcha; Giuseppe Cataldo; Jake Connors; Negar Ehsan; Thomas M. Essinger-Hileman; Henry Grant; James Hays-Wehle; Wen-Ting Hsieh; Vilem Mikula; S. Harvey Moseley; Omid Noroozian; Trevor R. Oxholm; Manuel A. Quijada; Jessica Patel; Thomas R. Stevenson; Eric R. Switzer; Carole Tucker; Kongpop U-Yen; Carolyn Volport; Edward J. Wollack

doi:10.1117/12.2630311

27 August 2022 Optical characterization and testbed development for μ-Spec integrated spectrometers

Maryam Rahmani, Alyssa Barlis, Emily M. Barrentine, Ari D. Brown, Berhanu T. Bulcha, Giuseppe Cataldo, Jake Connors, Negar Ehsan, Thomas M. Essinger-Hileman, Henry Grant, James Hays-Wehle, Wen-Ting Hsieh, Vilem Mikula, S. Harvey Moseley, Omid Noroozian, Trevor R. Oxholm, Manuel A. Quijada, Jessica Patel, Thomas R. Stevenson, Eric R. Switzer, Carole Tucker, Kongpop U-Yen, Carolyn Volport, Edward J. Wollack

Author Affiliations +

Proceedings Volume 12180, Space Telescopes and Instrumentation 2022: Optical, Infrared, and Millimeter Wave; 1218050 (2022) https://doi.org/10.1117/12.2630311
Event: SPIE Astronomical Telescopes + Instrumentation, 2022, Montréal, Québec, Canada

Conference Poster

Abstract

This paper describes a cryogenic optical testbed developed to characterize µ-Spec spectrometers in a dedicated dilution refrigerator (DR) system. μ-Spec is a far-infrared integrated spectrometer that is an analog to a Rowland-type grating spectrometer. It employs a single-crystal silicon substrate with niobium microstrip lines and aluminum kinetic inductance detectors (KIDs). Current designs with a resolution of R = λ/Δλ = 512 are in fabrication for the EXCLAIM (Experiment for Cryogenic Large Aperture Intensity Mapping) balloon mission. The primary spectrometer performance and design parameters are efficiency, NEP, inter-channel isolation, spectral resolution, and frequency response for each channel. Here we present the development and design of an optical characterization facility and preliminary validation of that facility with earlier prototype R=64 devices. We have conducted and describe initial optical measurements of R = 64 devices using a swept photomixer line source. We also discuss the test plan for optical characterization of the EXCLAIM R = 512 μ-Spec devices in this new testbed.

Conference Presentation

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Maryam Rahmani, Alyssa Barlis, Emily M. Barrentine, Ari D. Brown, Berhanu T. Bulcha, Giuseppe Cataldo, Jake Connors, Negar Ehsan, Thomas M. Essinger-Hileman, Henry Grant, James Hays-Wehle, Wen-Ting Hsieh, Vilem Mikula, S. Harvey Moseley, Omid Noroozian, Trevor R. Oxholm, Manuel A. Quijada, Jessica Patel, Thomas R. Stevenson, Eric R. Switzer, Carole Tucker, Kongpop U-Yen, Carolyn Volport, and Edward J. Wollack "Optical characterization and testbed development for μ-Spec integrated spectrometers", Proc. SPIE 12180, Space Telescopes and Instrumentation 2022: Optical, Infrared, and Millimeter Wave, 1218050 (27 August 2022); https://doi.org/10.1117/12.2630311

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