학술논문
Optimization of an Optical Testbed for Characterization of EXCLAIM u-Spec Integrated Spectrometers
Document Type
Working Paper
Author
Rahmani, Maryam; Barrentine, Emily M.; Switzer, Eric R.; Barlis, Alyssa; Brown, Ari D.; Cataldo, Giuseppe; Connors, Jake A.; Ehsan, Negar; Essinger-Hileman, Thomas M.; Grant, Henry; Hays-Wehle, James; Hsieh, Wen-Ting; Mikula, Vilem; Moseley, S. Harvey; Noroozian, Omid; Quijada, Manuel A.; Patel, Jessica; Stevenson, Thomas R.; Tucker, Carole; U-Yen, Kongpop; Volpert, Carolyn G.; Wollack, Edward J.
Source
Subject
Language
Abstract
We describe a testbed to characterize the optical response of compact superconducting on-chip spectrometers in development for the Experiment for Cryogenic Large-Aperture Intensity Mapping (EXCLAIM) mission. EXCLAIM is a balloonborne far-infrared experiment to probe the CO and CII emission lines in galaxies from redshift 3.5 to the present. The spectrometer, called u-Spec, comprises a diffraction grating on a silicon chip coupled to kinetic inductance detectors (KIDs) read out via a single microwave feedline. We use a prototype spectrometer for EXCLAIM to demonstrate our ability to characterize the spectrometers spectral response using a photomixer source. We utilize an on-chip reference detector to normalize relative to spectral structure from the off-chip optics and a silicon etalon to calibrate the absolute frequency.