NDLI: High-Reflectivity Coatings for a Vacuum Ultraviolet Spectropolarimeter

Content Provider	Springer Nature Link
Author	Narukage, riyuki Kubo, Masahito Ishikawa, Ryohko Ishikawa, Shin suke Katsukawa, Yukio Kobiki, Toshihiko Gio, Gabriel Ka, Ryouhei Bando, Takamasa Tsuneta, Saku Auchère, Frédéric Kobayashi, Ken Winebarger, Amy McCandless, Jim Chen, Jianrong Choi, Joanne
Copyright Year	2017
Abstract	Precise polarization measurements in the vacuum ultraviolet (VUV) region are expected to be a new tool for inferring the magnetic fields in the upper atmosphere of the Sun. High-reflectivity coatings are key elements to achieving high-throughput optics for precise polarization measurements. We fabricated three types of high-reflectivity coatings for a solar spectropolarimeter in the hydrogen Lyman- $α $ (Ly $α $ ; 121.567 nm) region and evaluated their performance. The first high-reflectivity mirror coating offers a reflectivity of more than 80 % in Ly $α $ optics. The second is a reflective narrow-band filter coating that has a peak reflectivity of 57 % in Ly $α $ , whereas its reflectivity in the visible light range is lower than 1/10 of the peak reflectivity ( $\sim 5~\%$ on average). This coating can be used to easily realize a visible light rejection system, which is indispensable for a solar telescope, while maintaining high throughput in the Ly $α $ line. The third is a high-efficiency reflective polarizing coating that almost exclusively reflects an s-polarized beam at its Brewster angle of 68° with a reflectivity of 55 %. This coating achieves both high polarizing power and high throughput. These coatings contributed to the high-throughput solar VUV spectropolarimeter called the Chromospheric Lyman-Alpha SpectroPolarimeter (CLASP), which was launched on 3 September, 2015.
Starting Page	1
Ending Page	17
Page Count	17
File Format	PDF
ISSN	00380938
Journal	Solar Physics
Volume Number	292
Issue Number	3
e-ISSN	1573093X
Language	English
Publisher	Springer Netherlands
Publisher Date	2017-02-20
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Instrumentation and data management Polarization, optical Spectrum, ultraviolet Magnetic fields, chromosphere Astrophysics and Astroparticles Atmospheric Sciences Space Sciences (including Extraterrestrial Physics, Space Exploration and Astronautics)
Content Type	Text
Resource Type	Article
Subject	Astronomy and Astrophysics Space and Planetary Science

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

Polarization Calibration of the Chromospheric Lyman-Alpha SpectroPolarimeter for a 0.1 % Polarization Sensitivity in the VUV Range. Part I: Pre-flight Calibration

Polarization Calibration of the Chromospheric Lyman-Alpha SpectroPolarimeter for a 0.1% Polarization Sensitivity in the VUV Range. Part II: In-Flight Calibration

Imaging Spectropolarimeter for the Multi-Application Solar Telescope at Udaipur Solar Observatory: Characterization of Polarimeter and Preliminary Observations

Strategy for Realizing High-Precision VUV Spectro-Polarimeter

Correlation Between Sunspot Number and Ca ii K Emission Index

The Interface Region Imaging Spectrograph (IRIS)

Rayleigh–Taylor Instability and Excitation of Super-Dreicer Electric Fields in the Solar Chromosphere

Variations in Ratio and Correlation of Solar Magnetic Fields in the Fe i 525.02 nm and Na i 589.59 nm Lines According to Mount Wilson Measurements During 2000 – 2012

The Origin of Sequential Chromospheric Brightenings

High-Reflectivity Coatings for a Vacuum Ultraviolet Spectropolarimeter

Similar Documents

Polarization Calibration of the Chromospheric Lyman-Alpha SpectroPolarimeter for a 0.1 % Polarization Sensitivity in the VUV Range. Part I: Pre-flight Calibration

Polarization Calibration of the Chromospheric Lyman-Alpha SpectroPolarimeter for a 0.1% Polarization Sensitivity in the VUV Range. Part II: In-Flight Calibration

Imaging Spectropolarimeter for the Multi-Application Solar Telescope at Udaipur Solar Observatory: Characterization of Polarimeter and Preliminary Observations

Strategy for Realizing High-Precision VUV Spectro-Polarimeter

Correlation Between Sunspot Number and Ca ii K Emission Index

The Interface Region Imaging Spectrograph (IRIS)

Rayleigh–Taylor Instability and Excitation of Super-Dreicer Electric Fields in the Solar Chromosphere

Variations in Ratio and Correlation of Solar Magnetic Fields in the Fe i 525.02 nm and Na i 589.59 nm Lines According to Mount Wilson Measurements During 2000 – 2012

The Origin of Sequential Chromospheric Brightenings

High-Reflectivity Coatings for a Vacuum Ultraviolet Spectropolarimeter