Performance of a 200?mm Diameter Achromatic HWP with Laser-Ablated Sub-Wavelength Structures
Performance of a 200?mm Diameter Achromatic HWP with Laser-Ablated Sub-Wavelength Structures
复制标题
具有激光烧蚀亚波长结构的 200 毫米直径消色差 HWP 的性能
DOI：
10.1007/s10909-022-02922-6
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发表时间：
2022
影响因子：
2
通讯作者：
for the?LiteBIRD?collaboration
中科院分区：
文献类型：
--
作者：
Takaku R.;Ghigna T.;Hanany S.;Hoshino Y.;Ishino H.;Katayama N.;Komatsu K.;Konishi K.;Kuwata-Gonokami M.;Matsumura T.;Sakurai H.;Sakurai Y.;Wen Q.;Yamasaki N. Y.;Yumoto J.;for the?LiteBIRD?collaboration
我们在直径为200 mm的双折射蓝宝石盘上激光烧蚀亚波长结构（SWS），以产生宽带抗反射涂层（ARC）。将盘组装成五个板的堆叠，使得消色差半波片（AHWP）适合于在40和140 GHz之间操作。我们报告的SWS制作和传输测量的堆栈在室温下。从测量，我们计算出一个波段的平均传输和调制效率为9个光谱波段，对应的频率覆盖的theLiteBIRD低频望远镜（LFT）。我们还评估了AHWP所展示的工具极化水平。我们讨论了进一步发展的路径，以尽量减少从AHWP的仪器极化。这项工作是实现theLiteBIRD卫星AHWP的一个发展里程碑。
We laser-ablated sub-wavelength structures (SWS) on 200 mm diameter birefringent sapphire disks to produce broadband anti-reflection coating (ARC). The disks were assembled into a stack of five plates making an achromatic half-wave plate (AHWP) suitable for operation between 40 and 140 GHz. We report on the SWS fabrication and transmission measurements of the stack at room temperature. From the measurements, we compute a band average transmission and modulation efficiency for nine spectral bands that correspond to the frequency coverage of theLiteBIRDLow-Frequency Telescope (LFT). We also assess the level of instrumental polarization the AHWP exhibits. We discuss paths for further development to minimize the instrumental polarization from the AHWP. This work is a development milestone toward the implementation of an AHWP for theLiteBIRDsatellite.