Performance of a 200 mm Diameter Achromatic HWP with Laser-Ablated Sub-Wavelength Structures

for the LiteBIRD collaboration

doi:10.1007/s10909-022-02922-6

Performance of a 200 mm Diameter Achromatic HWP with Laser-Ablated Sub-Wavelength Structures

for the LiteBIRD collaboration

Physics and Astronomy (Twin Cities)

Research output: Contribution to journal › Article › peer-review

1 Scopus citations

Abstract

We laser-ablated sub-wavelength structures (SWS) on 200 mm diameter birefringent sapphire disks to produce broadband anti-reflection coating (ARC). The disks were assembled into a stack of five plates making an achromatic half-wave plate (AHWP) suitable for operation between 40 and 140 GHz. We report on the SWS fabrication and transmission measurements of the stack at room temperature. From the measurements, we compute a band average transmission and modulation efficiency for nine spectral bands that correspond to the frequency coverage of the LiteBIRD Low-Frequency Telescope (LFT). We also assess the level of instrumental polarization the AHWP exhibits. We discuss paths for further development to minimize the instrumental polarization from the AHWP. This work is a development milestone toward the implementation of an AHWP for the LiteBIRD satellite.

Original language	English (US)
Pages (from-to)	346-356
Number of pages	11
Journal	Journal of Low Temperature Physics
Volume	211
Issue number	5-6
DOIs	https://doi.org/10.1007/s10909-022-02922-6
State	Published - Jun 2023

Bibliographical note

Funding Information:
We acknowledge the World Premier International Research Center Initiative (WPI), MEXT, Japan for support through Kavli IPMU. This work was supported by JSPS KAKENHI Grant Numbers JP17H01125, 19K14732, 18J20148, 18KK0083, and JSPS Core-to-Core Program, A. Advanced Research Networks. This work was also supported by the New Energy and Industrial Technology Development Organization (NEDO) project “Development of advanced laser processing with intelligence based on high-brightness and high efficiency laser technologies” by Council for Science, Technology and Innovation (CSTI), Cross-ministerial Strategic Innovation Promotion Program (SIP), “Photonics and Quantum Technology for Society 5.0” and by the Center of Innovation Program, from Japan Science and Technology Agency, JST. LiteBIRD (phase A) activities are supported by the following funding sources: ISAS/JAXA, MEXT, JSPS, KEK (Japan); CSA (Canada); CNES, CNRS, CEA (France); DFG (Germany); ASI, INFN, INAF (Italy); RCN (Norway); AEI (Spain); SNSA, SRC (Sweden); NASA, DOE (USA).

Publisher Copyright:
© 2022, The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature.

Keywords

Broadband achromatic half-wave plate
Broadband anti-reflection
Cosmic microwave background
Laser machining
Millimeter-wave instruments

Publisher link

10.1007/s10909-022-02922-6

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title = "Performance of a 200 mm Diameter Achromatic HWP with Laser-Ablated Sub-Wavelength Structures",

abstract = "We laser-ablated sub-wavelength structures (SWS) on 200 mm diameter birefringent sapphire disks to produce broadband anti-reflection coating (ARC). The disks were assembled into a stack of five plates making an achromatic half-wave plate (AHWP) suitable for operation between 40 and 140 GHz. We report on the SWS fabrication and transmission measurements of the stack at room temperature. From the measurements, we compute a band average transmission and modulation efficiency for nine spectral bands that correspond to the frequency coverage of the LiteBIRD Low-Frequency Telescope (LFT). We also assess the level of instrumental polarization the AHWP exhibits. We discuss paths for further development to minimize the instrumental polarization from the AHWP. This work is a development milestone toward the implementation of an AHWP for the LiteBIRD satellite.",

keywords = "Broadband achromatic half-wave plate, Broadband anti-reflection, Cosmic microwave background, Laser machining, Millimeter-wave instruments",

author = "{for the LiteBIRD collaboration} and R. Takaku and T. Ghigna and S. Hanany and Y. Hoshino and H. Ishino and N. Katayama and K. Komatsu and K. Konishi and M. Kuwata-Gonokami and T. Matsumura and H. Sakurai and Y. Sakurai and Q. Wen and Yamasaki, {N. Y.} and J. Yumoto",

note = "Funding Information: We acknowledge the World Premier International Research Center Initiative (WPI), MEXT, Japan for support through Kavli IPMU. This work was supported by JSPS KAKENHI Grant Numbers JP17H01125, 19K14732, 18J20148, 18KK0083, and JSPS Core-to-Core Program, A. Advanced Research Networks. This work was also supported by the New Energy and Industrial Technology Development Organization (NEDO) project “Development of advanced laser processing with intelligence based on high-brightness and high efficiency laser technologies” by Council for Science, Technology and Innovation (CSTI), Cross-ministerial Strategic Innovation Promotion Program (SIP), “Photonics and Quantum Technology for Society 5.0” and by the Center of Innovation Program, from Japan Science and Technology Agency, JST. LiteBIRD (phase A) activities are supported by the following funding sources: ISAS/JAXA, MEXT, JSPS, KEK (Japan); CSA (Canada); CNES, CNRS, CEA (France); DFG (Germany); ASI, INFN, INAF (Italy); RCN (Norway); AEI (Spain); SNSA, SRC (Sweden); NASA, DOE (USA). Publisher Copyright: {\textcopyright} 2022, The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature.",

year = "2023",

month = jun,

doi = "10.1007/s10909-022-02922-6",

language = "English (US)",

volume = "211",

pages = "346--356",

journal = "Journal of Low Temperature Physics",

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T1 - Performance of a 200 mm Diameter Achromatic HWP with Laser-Ablated Sub-Wavelength Structures

AU - for the LiteBIRD collaboration

AU - Takaku, R.

AU - Ghigna, T.

AU - Hanany, S.

AU - Hoshino, Y.

AU - Ishino, H.

AU - Katayama, N.

AU - Komatsu, K.

AU - Konishi, K.

AU - Kuwata-Gonokami, M.

AU - Matsumura, T.

AU - Sakurai, H.

AU - Sakurai, Y.

AU - Wen, Q.

AU - Yamasaki, N. Y.

AU - Yumoto, J.

N1 - Funding Information: We acknowledge the World Premier International Research Center Initiative (WPI), MEXT, Japan for support through Kavli IPMU. This work was supported by JSPS KAKENHI Grant Numbers JP17H01125, 19K14732, 18J20148, 18KK0083, and JSPS Core-to-Core Program, A. Advanced Research Networks. This work was also supported by the New Energy and Industrial Technology Development Organization (NEDO) project “Development of advanced laser processing with intelligence based on high-brightness and high efficiency laser technologies” by Council for Science, Technology and Innovation (CSTI), Cross-ministerial Strategic Innovation Promotion Program (SIP), “Photonics and Quantum Technology for Society 5.0” and by the Center of Innovation Program, from Japan Science and Technology Agency, JST. LiteBIRD (phase A) activities are supported by the following funding sources: ISAS/JAXA, MEXT, JSPS, KEK (Japan); CSA (Canada); CNES, CNRS, CEA (France); DFG (Germany); ASI, INFN, INAF (Italy); RCN (Norway); AEI (Spain); SNSA, SRC (Sweden); NASA, DOE (USA). Publisher Copyright: © 2022, The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature.

PY - 2023/6

Y1 - 2023/6

N2 - We laser-ablated sub-wavelength structures (SWS) on 200 mm diameter birefringent sapphire disks to produce broadband anti-reflection coating (ARC). The disks were assembled into a stack of five plates making an achromatic half-wave plate (AHWP) suitable for operation between 40 and 140 GHz. We report on the SWS fabrication and transmission measurements of the stack at room temperature. From the measurements, we compute a band average transmission and modulation efficiency for nine spectral bands that correspond to the frequency coverage of the LiteBIRD Low-Frequency Telescope (LFT). We also assess the level of instrumental polarization the AHWP exhibits. We discuss paths for further development to minimize the instrumental polarization from the AHWP. This work is a development milestone toward the implementation of an AHWP for the LiteBIRD satellite.

AB - We laser-ablated sub-wavelength structures (SWS) on 200 mm diameter birefringent sapphire disks to produce broadband anti-reflection coating (ARC). The disks were assembled into a stack of five plates making an achromatic half-wave plate (AHWP) suitable for operation between 40 and 140 GHz. We report on the SWS fabrication and transmission measurements of the stack at room temperature. From the measurements, we compute a band average transmission and modulation efficiency for nine spectral bands that correspond to the frequency coverage of the LiteBIRD Low-Frequency Telescope (LFT). We also assess the level of instrumental polarization the AHWP exhibits. We discuss paths for further development to minimize the instrumental polarization from the AHWP. This work is a development milestone toward the implementation of an AHWP for the LiteBIRD satellite.

KW - Broadband achromatic half-wave plate

KW - Broadband anti-reflection

KW - Cosmic microwave background

KW - Laser machining

KW - Millimeter-wave instruments

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JO - Journal of Low Temperature Physics

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