Optical design of a near-infrared birefringent filter system and measurement of birefringence index of calcite
Optical design of a near-infrared birefringent filter system and measurement of birefringence index of calcite
复制标题
近红外双折射滤光系统的光学设计及方解石双折射率的测量
DOI：
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发表时间：
2000
期刊：
影响因子：
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通讯作者：
C. Denker
中科院分区：
文献类型：
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作者：
Jing;Haimin Wang;T. Spirock;Chik;N. Ravindra;Jun Ma;P. Goode;C. Denker
本文设计了一种近红外（fe15648.5 a）双折射滤光系统，用于大熊太阳天文台（BBSO）的太阳彩色图像采集和太阳磁场测量。该系统由预滤波器、液晶分析仪、波长可调双折射滤波器和法布里-珀罗标准龙组成。该系统有望实现干净的窄通带（1/8A）。它也可以在光谱线上进行调谐，以获得二维视场的线轮廓。在可调谐近红外双折射滤光片的设计和元件测试过程中，我们发现方解石在15648.5A附近光谱范围内的双折射率μ(neno)值与文献中的值有很大差异。由于双折射率对双折射光学元件的设计具有重要意义，本文测量了方解石的双折射率及其热系数。介绍了用于双折射滤光片的四对方解石板的一些试验结果。
In this paper, we present an optical design of a near- infrared (at FeI 15648.5A) birefringent filter system which is used to obtain the chromatic images of the sun and measure the solar magnetic field at the Big Bear Solar Observatory (BBSO). This system consists of a prefilter,a liquid crystal analyzer, a wavelength-tunable birefringent filter and a Fabry-Perot Etalon. This system is expected to achieve a clean narrow pass band (1/8A). It can also be tuned across the spectral line to obtain line profiles of two0dimensional fields of view. During the design of the tunable near-IR birefringent filter and the test of its components, we found the value of birefringence index μ(ne-no) of calcite at spectral range near 15648.5A is very different from the value in literature. Because the birefringence index is important for the design of birefringent optical components, the birefringence index of calcite and its thermal coefficient are measured. Some test results of the four pairs of calcite plate used in the birefringent filter are presented.