用于红外偏振成像应用的有限光谱和角带宽范围内四分之一波片的比较。

Comparison of quarter-wave retarders over finite spectral and angular bandwidths for infrared polarimetric-imaging applications.

作者信息

Wadsworth Samuel L, Boreman Glenn D

机构信息

CREOL, The College of Optics and Photonics, University of Central Florida, Orlando, Florida 32816, USA.

出版信息

Appl Opt. 2011 Dec 20;50(36):6682-8. doi: 10.1364/AO.50.006682.

DOI:10.1364/AO.50.006682

PMID:22193200

Abstract

We compare three technological approaches for quarter-wave retarders within the context of polarimetric-imaging applications in the long-wave infrared (LWIR) spectrum. Performance of a commercial cadmium sulfide (CdS) crystalline waveplate, a multilayer meanderline structure, and a silicon (Si) form-birefringent retarder are evaluated under conditions of 8-12 μm broadband radiation emerging from an F/1 focusing objective. Metrics used for this comparison are the spectrally dependent axial ratio, retardance, and polarization-averaged power transmittance, which are averaged over the angular range of interest. These parameters correspond to the characteristics that would be observed at the focal-plane array (FPA) detector of an LWIR imaging polarimeter.

摘要

我们在长波红外（LWIR）光谱的偏振成像应用背景下，比较了三种用于四分之一波片的技术方法。在从F/1聚焦物镜出射的8 - 12μm宽带辐射条件下，评估了商用硫化镉（CdS）晶体波片、多层曲折线结构和硅（Si）形式双折射延迟器的性能。用于此比较的指标是与光谱相关的轴比、延迟量和偏振平均功率透过率，这些指标在感兴趣的角度范围内进行了平均。这些参数对应于LWIR成像偏振计焦平面阵列（FPA）探测器上会观察到的特性。