The POLARBEAR Fourier transform spectrometer calibrator and spectroscopic characterization of the POLARBEAR instrument

F. Matsuda, L. Lowry, A. Suzuki, M. Aguilar Fáundez, K. Arnold, D. Barron, F. Bianchini, K. Cheung, Y. Chinone, T. Elleflot, G. Fabbian, N. Goeckner-Wald, M. Hasegawa, D. Kaneko, N. Katayama, B. Keating, A. T. Lee, M. Navaroli, H. Nishino, H. PaarG. Puglisi, P. L. Richards, J. Seibert, P. Siritanasak, O. Tajima, S. Takatori, C. Tsai, B. Westbrook

Research output: Contribution to journalReview articlepeer-review

9 Citations (Scopus)


We describe the Fourier Transform Spectrometer (FTS) used for in-field testing of the POLARBEAR receiver, an experiment located in the Atacama Desert of Chile which measures the cosmic microwave background (CMB) polarization. The POLARBEAR-FTS (PB-FTS) is a Martin-Puplett interferometer designed to couple to the Huan Tran Telescope (HTT) on which the POLARBEAR receiver is installed. The PB-FTS measured the spectral response of the POLARBEAR receiver with signal-to-noise ratio >20 for ∼69% of the focal plane detectors due to three features: a high throughput of 15.1 sr cm2, optimized optical coupling to the POLARBEAR optics using a custom designed output parabolic mirror, and a continuously modulated output polarizer. The PB-FTS parabolic mirror is designed to mimic the shape of the 2.5 m-diameter HTT primary reflector, which allows for optimum optical coupling to the POLARBEAR receiver, reducing aberrations and systematics. One polarizing grid is placed at the output of the PB-FTS and modulated via continuous rotation. This modulation allows for decomposition of the signal into different harmonics that can be used to probe potentially pernicious sources of systematic error in a polarization-sensitive instrument. The high throughput and continuous output polarizer modulation features are unique compared to other FTS calibrators used in the CMB field. In-field characterization of the POLARBEAR receiver was accomplished using the PB-FTS in April 2014. We discuss the design, construction, and operation of the PB-FTS and present the spectral characterization of the POLARBEAR receiver. We introduce future applications for the PB-FTS in the next-generation CMB experiment, the Simons Array.

Original languageEnglish
Article number115115
JournalReview of Scientific Instruments
Issue number11
Publication statusPublished - Nov 1 2019
Externally publishedYes

ASJC Scopus subject areas

  • Instrumentation


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