Cryogenic spectrometer for measuring the far-IR to millimeter-wave absorptivity of cosmic analog dusts

Document Type

Article

Publication Date

7-10-2021

Abstract

We report on the design, construction, and performance of a custom apparatus built to measure the frequencyand temperature-dependent absorptivity of millimeter-wave light by cosmic analog dusts. We highlight the unique challenges faced as well as a few key innovations that are part of the instrument. Among those is an ultra-compact Fourier transform spectrometer. We have measured its effective frequency range and FWHM resolution to be 150 2100 GHz and_45 GHz, respectively. Another innovation is a cold sample positioner whose temperature can be controlled within the range of 3.7 50 K. The use of a pulse-Tube cryocooler results in a pulsesynchronous signal that dominates the detector (bolometer) signal.Methods used to address that challenge are also presented.

Identifier

85109639049 (Scopus)

Publication Title

Applied Optics

External Full Text Location

https://doi.org/10.1364/AO.427831

e-ISSN

21553165

ISSN

1559128X

PubMed ID

34263809

First Page

5880

Last Page

5890

Issue

20

Volume

60

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