Ly-alpha polarimeter design for CLASP rocket experiment
Ly-alpha polarimeter design for CLASP rocket experiment
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CLASP火箭实验的Ly-alpha旋光计设计
DOI：
10.1117/12.893241
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发表时间：
2011
期刊：
影响因子：
--
通讯作者：
et al
中科院分区：
文献类型：
--
作者：
H.Watanabe;et al
一个名为Chromospheric Lyman-Alpha Spectro-Polarimeter（CLASP）的探测火箭计划将于2014年夏季发射。CLASP将观测Ly-alpha（121.567 nm）的太阳色球层，旨在首次探测散射过程和汉勒效应产生的线性偏振信号。CLASP的偏振计由旋转半波片、分束器和偏振分析器组成。氟化镁（MgF 2）用于这些光学部件，因为MgF 2在紫外波长下表现出双折射性质和高透明度。目前正在利用紫外同步加速器轨道辐射设施的同步加速器光束线对偏振计的光学部件进行开发和全面测试。第一个目的是通过测量MgF 2在s偏振光和p偏振光下的反射率和透射率，得到MgF 2的光学常数。利用最小二乘拟合方法，在反射率和透射率满足Kramers-Krönig关系的条件下，得到了沿寻常轴和非寻常轴的寻常折射率和消光系数沿着轴的分布。证实了氟化镁板在布鲁斯特角处的反射在Ly-alpha处成为良好的偏振分析器。第二个目标是测量由MgF 2制成的零级波片的延迟。波片的延迟是通过观察波片和偏振分析仪输出的调制幅度来确定的。我们测试了厚度差为14.57 μ m的波片。14.57 μ m波片在121.74 nm处起半波片的作用。我们推导出厚度差为15.71 μ m的波片在Ly-α波长处可作为半波片工作。利用氟化镁半波片和偏振分析仪研制了CLASP偏振仪样机，并成功地获得了与理论预测一致的调制模式。我们确认，原型的性能是最佳的测量线偏振信号的串扰的影响最小的圆偏振。
A sounding-rocket program called the Chromospheric Lyman-Alpha Spectro-Polarimeter (CLASP) is proposed to be launched in the summer of 2014. CLASP will observe the solar chromosphere in Ly-alpha (121.567 nm), aiming to detect the linear polarization signal produced by scattering processes and the Hanle effect for the first time. The polarimeter of CLASP consists of a rotating half-waveplate, a beam splitter, and a polarization analyzer. Magnesium Fluoride (MgF2) is used for these optical components, because MgF2 exhibits birefringent property and high transparency at ultraviolet wavelength. The development and comprehensive testing program of the optical components of the polarimeter is underway using the synchrotron beamline at the Ultraviolet Synchrotron Orbital Radiation Facility (UVSOR). The first objective is deriving the optical constants of MgF2 by the measurement of the reflectance and transmittance against oblique incident angles for the s-polarized and the p-polarized light. The ordinary refractive index and extinction coefficient along the ordinary and extraordinary axes are derived with a least-square fitting in such a way that the reflectance and transmittance satisfy the Kramers-Krönig relation. The reflection at the Brewster's Angle of MgF2 plate is confirmed to become a good polarization analyzer at Ly-alpha. The second objective is the retardation measurement of a zeroth-order waveplate made of MgF2. The retardation of a waveplate is determined by observing the modulation amplitude that comes out of a waveplate and a polarization analyzer. We tested a waveplate with the thickness difference of 14.57 um. The 14.57 um waveplate worked as a half-waveplate at 121.74 nm. We derived that a waveplate with the thickness difference of 15.71 um will work as a half-waveplate at Ly-alpha wavelength. We developed a prototype of CLASP polarimeter using the MgF2 half-waveplate and polarization analyzers, and succeeded in obtaining the modulation patterns that are consistent with the theoretical prediction. We confirm that the performance of the prototype is optimized for measuring linear polarization signal with the least effect of the crosstalk from the circular polarization.
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