Prototype design and evaluation of the nine-layer achromatic half-wave plate for the LiteBIRD low frequency telescope

Kunimoto Komatsu; Tomotake Matsumura; Masashi Hazumi; Hiroaki Imada; Hirokazu Ishino; Nobuhiko Katayama; Yuki Sakurai; Hajime Sugai; Ryota Takaku

doi:10.1117/12.2312431

Prototype design and evaluation of the nine-layer achromatic half-wave plate for the LiteBIRD low frequency telescope

Kunimoto Komatsu, Tomotake Matsumura, Masashi Hazumi, Hiroaki Imada, Hirokazu Ishino, Nobuhiko Katayama, Yuki Sakurai, Hajime Sugai, Ryota Takaku

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

6 Citations (Scopus)

Abstract

LiteBIRD is a satellite project to measure the polarization of the CMB with an unprecedented accuracy. LiteBIRD observes all sky for three years at the sun-earth second Lagrange point. The goal of LiteBIRD is to observe the B-mode polarization at large angular scales and to measure the tensor-to-scaler ratio r with an accuracy less than 0.001, exploring the energy scale of the inflation. In order to mitigate the system 1/f noise and systematics, we plan to use continuous rotating half-wave plates (HWPs) as a polarization modulator at each aperture of two telescopes. One of the telescopes, called a low frequency telescope (LFT), covers the frequency range from 34 to 270 GHz, requiring the HWP to have a high modulation efficiency in the wide bandwidth. We employ a Pancharatnam-type achromatic HWP (AHWP) to achieve the broadband coverage. The AHWP consists of nine layer stacked HWPs with the optic axes mutually rotated by the angles optimized for the LFT bandwidth. In this paper, we report our development status of the nine layer AHWP and measurement results on the modulation efficiency and the phase as a function of frequency.

Original language	English
Title of host publication	Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy IX
Editors	Jonas Zmuidzinas, Jian-Rong Gao
Publisher	SPIE
ISBN (Print)	9781510619692
DOIs	https://doi.org/10.1117/12.2312431
Publication status	Published - 2018
Event	Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy IX 2018 - Austin, United States Duration: Jun 12 2018 → Jun 15 2018

Publication series

Name	Proceedings of SPIE - The International Society for Optical Engineering
Volume	10708
ISSN (Print)	0277-786X
ISSN (Electronic)	1996-756X

Other

Other	Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy IX 2018
Country/Territory	United States
City	Austin
Period	6/12/18 → 6/15/18

Keywords

Achromatic half-wave plate
B-mode
CMB polarization
Space mission

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Computer Science Applications
Applied Mathematics
Electrical and Electronic Engineering

Access to Document

10.1117/12.2312431

Cite this

Komatsu, K., Matsumura, T., Hazumi, M., Imada, H., Ishino, H., Katayama, N., Sakurai, Y., Sugai, H., & Takaku, R. (2018). Prototype design and evaluation of the nine-layer achromatic half-wave plate for the LiteBIRD low frequency telescope. In J. Zmuidzinas, & J-R. Gao (Eds.), Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy IX [1070847] (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 10708). SPIE. https://doi.org/10.1117/12.2312431

Prototype design and evaluation of the nine-layer achromatic half-wave plate for the LiteBIRD low frequency telescope. / Komatsu, Kunimoto; Matsumura, Tomotake; Hazumi, Masashi et al.

Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy IX. ed. / Jonas Zmuidzinas; Jian-Rong Gao. SPIE, 2018. 1070847 (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 10708).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Komatsu, K, Matsumura, T, Hazumi, M, Imada, H, Ishino, H, Katayama, N, Sakurai, Y, Sugai, H & Takaku, R 2018, Prototype design and evaluation of the nine-layer achromatic half-wave plate for the LiteBIRD low frequency telescope. in J Zmuidzinas & J-R Gao (eds), Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy IX., 1070847, Proceedings of SPIE - The International Society for Optical Engineering, vol. 10708, SPIE, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy IX 2018, Austin, United States, 6/12/18. https://doi.org/10.1117/12.2312431

Komatsu K, Matsumura T, Hazumi M, Imada H, Ishino H, Katayama N et al. Prototype design and evaluation of the nine-layer achromatic half-wave plate for the LiteBIRD low frequency telescope. In Zmuidzinas J, Gao J-R, editors, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy IX. SPIE. 2018. 1070847. (Proceedings of SPIE - The International Society for Optical Engineering). doi: 10.1117/12.2312431

Komatsu, Kunimoto ; Matsumura, Tomotake ; Hazumi, Masashi et al. / Prototype design and evaluation of the nine-layer achromatic half-wave plate for the LiteBIRD low frequency telescope. Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy IX. editor / Jonas Zmuidzinas ; Jian-Rong Gao. SPIE, 2018. (Proceedings of SPIE - The International Society for Optical Engineering).

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abstract = "LiteBIRD is a satellite project to measure the polarization of the CMB with an unprecedented accuracy. LiteBIRD observes all sky for three years at the sun-earth second Lagrange point. The goal of LiteBIRD is to observe the B-mode polarization at large angular scales and to measure the tensor-to-scaler ratio r with an accuracy less than 0.001, exploring the energy scale of the inflation. In order to mitigate the system 1/f noise and systematics, we plan to use continuous rotating half-wave plates (HWPs) as a polarization modulator at each aperture of two telescopes. One of the telescopes, called a low frequency telescope (LFT), covers the frequency range from 34 to 270 GHz, requiring the HWP to have a high modulation efficiency in the wide bandwidth. We employ a Pancharatnam-type achromatic HWP (AHWP) to achieve the broadband coverage. The AHWP consists of nine layer stacked HWPs with the optic axes mutually rotated by the angles optimized for the LFT bandwidth. In this paper, we report our development status of the nine layer AHWP and measurement results on the modulation efficiency and the phase as a function of frequency.",

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AU - Ishino, Hirokazu

AU - Katayama, Nobuhiko

AU - Sakurai, Yuki

AU - Sugai, Hajime

AU - Takaku, Ryota

N1 - Funding Information: This work is supported by JSPS KAKENHI Grant Number JP17H01125, JP15H05441, JP 15H05891, JP17K14272, JP18J20148 and JSPS Core-to-Core Program, A. Advanced Research Networks. Publisher Copyright: © 2018 SPIE.

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N2 - LiteBIRD is a satellite project to measure the polarization of the CMB with an unprecedented accuracy. LiteBIRD observes all sky for three years at the sun-earth second Lagrange point. The goal of LiteBIRD is to observe the B-mode polarization at large angular scales and to measure the tensor-to-scaler ratio r with an accuracy less than 0.001, exploring the energy scale of the inflation. In order to mitigate the system 1/f noise and systematics, we plan to use continuous rotating half-wave plates (HWPs) as a polarization modulator at each aperture of two telescopes. One of the telescopes, called a low frequency telescope (LFT), covers the frequency range from 34 to 270 GHz, requiring the HWP to have a high modulation efficiency in the wide bandwidth. We employ a Pancharatnam-type achromatic HWP (AHWP) to achieve the broadband coverage. The AHWP consists of nine layer stacked HWPs with the optic axes mutually rotated by the angles optimized for the LFT bandwidth. In this paper, we report our development status of the nine layer AHWP and measurement results on the modulation efficiency and the phase as a function of frequency.

AB - LiteBIRD is a satellite project to measure the polarization of the CMB with an unprecedented accuracy. LiteBIRD observes all sky for three years at the sun-earth second Lagrange point. The goal of LiteBIRD is to observe the B-mode polarization at large angular scales and to measure the tensor-to-scaler ratio r with an accuracy less than 0.001, exploring the energy scale of the inflation. In order to mitigate the system 1/f noise and systematics, we plan to use continuous rotating half-wave plates (HWPs) as a polarization modulator at each aperture of two telescopes. One of the telescopes, called a low frequency telescope (LFT), covers the frequency range from 34 to 270 GHz, requiring the HWP to have a high modulation efficiency in the wide bandwidth. We employ a Pancharatnam-type achromatic HWP (AHWP) to achieve the broadband coverage. The AHWP consists of nine layer stacked HWPs with the optic axes mutually rotated by the angles optimized for the LFT bandwidth. In this paper, we report our development status of the nine layer AHWP and measurement results on the modulation efficiency and the phase as a function of frequency.

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ER -

Prototype design and evaluation of the nine-layer achromatic half-wave plate for the LiteBIRD low frequency telescope

Abstract

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