Millimeter-wave achromatic half-wave plate.
Millimeter-wave achromatic half-wave plate.
复制标题
毫米波消色差半波片。
DOI：
10.1364/ao.44.004666
复制
发表时间：
2005
期刊：
影响因子：
1.9
通讯作者：
M. Thibodeau
中科院分区：
文献类型：
--
作者：
S. Hanany;J. Hubmayr;Bradley R. Johnson;T. Matsumura;P. Oxley;M. Thibodeau
我们构造了一种适用于毫米波段的消色差半波片。AHWP是由三块蓝宝石a切双折射板堆叠而成的，中间板的光轴相对于其他板的对准轴线旋转了50.5°。在110 GHz处测得AHWP的调制效率为96+/-1.5%。相比之下，相同厚度的单一蓝宝石板的调制效率为43+/-4%。这两个结果都与理论预测非常一致。AHWP的调制效率在0°到15°之间作为入射角的函数是恒定的。我们在毫米波波段的天体物理宽带偏振测量的背景下讨论了AHWP的设计参数。
We have constructed an achromatic half-wave plate (AHWP) suitable for the millimeter wavelength band. The AHWP was made from a stack of three sapphire a-cut birefringent plates with the opticalaxes of the middle plate rotated by 50.5 deg with respect to the aligned axes of the other plates. The measured modulation efficiency of the AHWP at 110 GHz was 96 +/- 1.5%. In contrast, the modulation efficiency of a single sapphire plate of the same thickness was 43 +/- 4%. Both results are in close agreement with theoretical predictions. The modulation efficiency of the AHWP was constant as a function of incidence angles between 0 and 15 deg. We discuss design parameters of an AHWP in the context of astrophysical broadband polarimetry at the millimeter wavelength band.