Spectral calibration of SPHEREx focal plane

Howard Hui; James Bock; Sam Condon; Charles D. Dowell; Matt Hollister; Phil Korngut; Ken Manatt; Chi Nguyen; Hien Nguyen; Steve Padin; Marco Viero

doi:10.1117/12.2628636

29 August 2022 Spectral calibration of SPHEREx focal plane

Howard Hui, James Bock, Sam Condon, Charles D. Dowell, Matt Hollister, Phil Korngut, Ken Manatt, Chi Nguyen, Hien Nguyen, Steve Padin, Marco Viero

Author Affiliations +

Proceedings Volume 12180, Space Telescopes and Instrumentation 2022: Optical, Infrared, and Millimeter Wave; 121801J (2022) https://doi.org/10.1117/12.2628636
Event: SPIE Astronomical Telescopes + Instrumentation, 2022, Montréal, Québec, Canada

Abstract

SPHEREx is a NASA Medium Explorer mission planned for launch in early 2025. It will produce an all-sky near infrared spectral survey from 0.75µm to 5µm with 6.2”x 6.2” pixels and spectral resolving power ranging between R=35 and R=130. Each focal plane assembly (FPA) comprises three 2048x2048 H2RG detector arrays. The H2RG detector is paired with a Linear Variable Filter, placed just above the detector, that defines a spectral response that varies over the detector along one spatial direction. Two FPAs view the sky through a dichroic beamsplitter, where the short-wave FPA uses three 2.5µm cutoff H2RGs and the mid-wave FPA uses three 5.3µm cutoff H2RGs. We developed a novel laboratory setup to carry out spectral response measurements of every pixel by coupling a cryogenic Winston Cone and integrating spheres to a grating spectrometer which allows us to measure the full 2x3.5°x11.3° field of view simultaneously. This presentation will present the design of the test apparatus and results.

Conference Presentation

Citation Download Citation

Howard Hui, James Bock, Sam Condon, Charles D. Dowell, Matt Hollister, Phil Korngut, Ken Manatt, Chi Nguyen, Hien Nguyen, Steve Padin, and Marco Viero "Spectral calibration of SPHEREx focal plane", Proc. SPIE 12180, Space Telescopes and Instrumentation 2022: Optical, Infrared, and Millimeter Wave, 121801J (29 August 2022); https://doi.org/10.1117/12.2628636

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