Dual-beam polarimeter based on nonachromatic wave plates with high polarimetric efficiency over a broad band
-
Published:2023-03-17
Issue:9
Volume:62
Page:2245
-
ISSN:1559-128X
-
Container-title:Applied Optics
-
language:en
-
Short-container-title:Appl. Opt.
Author:
Wan Fan1,
Zhong Yue,
Qu Zhongquan1,
Xu Zhi,
Zhang Hui
Affiliation:
1. University of Chinese Academy of Sciences
Abstract
The design
and
test
of a dual-beam polarimeter to
be applied to the Fiber Array Solar Optical Telescope of the second
generation is described. The polarimeter consists of a half and a
quarter nonachromatic wave plate, followed by a polarizing beam
splitter as a polarization analyzer. It has the features of simple
structure, stable operation, and temperature insensitivity. The most
outstanding feature of the polarimeter is that a combination of
commercial nonachromatic wave plates is used as a modulator to have
the high polarimetric efficiency of the Stokes polarization parameters
over 500–900 nm; the efficiency balance among the linear and circular
polarization parameters is also taken into account. In order to see
the stability and reliability of this polarimeter, we perform the
actual measurement of the polarimetric efficiencies of the assembling
polarimeter in the laboratory. It is found that the lowest linear
polarimetric efficiency is over 0.46, the lowest circular polarimetric
efficiency is above 0.47, and the total polarimetric efficiency is
greater than 0.93 over 500–900 nm. The measured results are basically
consistent with the theoretical design. Thus, the polarimeter
guarantees observers to choose freely spectral lines, formed in
different layers of the solar atmosphere. It can be concluded that
such a dual-beam polarimeter based on nonachromatic wave plates has
excellent performance and can be extensively applied in astronomical
measurement.
Funder
Bureau of Science and Technology for
Development, Chinese Academy of Sciences
National Natural Science Foundation of
China
Publisher
Optica Publishing Group
Subject
Atomic and Molecular Physics, and Optics,Engineering (miscellaneous),Electrical and Electronic Engineering
Reference28 articles.
1. Solar Magnetic Fields
2. Generation and transfer of
polarized radiation in the solar atmosphere: physical mechanisms and
magnetic-field diagnostics;Landi Degl’InnocentiHagyard,1985
3. The Daniel K. Inouye Solar Telescope – Observatory Overview
4. The 1.5 meter solar telescope GREGOR
5. A fiber arrayed solar optical
telescope (FASOT);QuKuhn,2011