Optical Characterization & Testbed Development for {\mu}-Spec Integrated Spectrometers
Abstract
This paper describes a cryogenic optical testbed developed to characterize u-Spec spectrometers in a dedicated dilution refrigerator (DR) system. u-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 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 u-Spec devices in this new testbed.
Cite
@article{arxiv.2208.06401,
title = {Optical Characterization & Testbed Development for {\mu}-Spec Integrated Spectrometers},
author = {Maryam Rahmani and Alyssa Barlis and Emily M. Barrentine and Ari D. Brown and Berhanu T. Bulcha and Giuseppe Cataldo and Jake Connors and Negar Ehsan and Thomas M. Essinger-Hileman and Henry Grant and James Hays-Wehle and Wen-Ting Hsieh and Vilem Mikula and S. Harvey Moseley and Omid Noroozian and Trevor R. Oxholm and Manuel A. Quijada and Jessica Patel and Thomas R. Stevenson and Eric R. Switzer and Carole Tucker and Kongpop U-Yen and Carolyn Volpert and Edward J. Wollack},
journal= {arXiv preprint arXiv:2208.06401},
year = {2022}
}
Comments
SPIE conference, Montreal, Ca. July 17-22, 2022