连续波腔衰荡偏振法
Continuous-Wave Cavity Ring-Down Polarimetry
摘要：
我们提出了一种新的基于腔的偏振测量方案，用于高灵敏度和时间分辨的双折射和二向色性，线性和圆形测量，该方案采用快速脉冲单频CW激光源，并扩展了当前基于腔的分光偏振技术。我们演示了如何使用CW激光源允许增益的光谱分辨率，信号强度和数据采集速率相比，传统的基于脉冲的腔衰荡偏振（CRDP）。我们讨论了一个特定的CW-CRDP模式，这是不同的强度为基础的腔增强极化方案，因为它依赖于确定的偏振旋转频率在振铃事件产生的大腔内偏振各向异性。介绍了CW-CRDP的原理，并验证了该技术在测量固体SiO $_2$、CeF $_3$和气态丁烷的非共振法拉第效应中的适用性。我们给出了一个一般性的分析CRDP技术的基本灵敏度限制，并显示如何提出的基于频率的方法来实现高精细腔的要求，以实现高的偏振灵敏度，因此，允许扩展到不同的光谱制度，但最重要的是，使CW-CRDP方法特别适合于强大的便携式偏振仪器。
英文摘要：
We present a new cavity-based polarimetric scheme for highly sensitive and time-resolved measurements of birefringence and dichroism, linear and circular, that employs rapidly-pulsed single-frequency CW laser sources and extends current cavity-based spectropolarimetric techniques. We demonstrate how the use of a CW laser source allows for gains in spectral resolution, signal intensity and data acquisition rate compared to traditional pulsed-based cavity ring-down polarimetry (CRDP). We discuss a particular CW-CRDP modality that is different from intensity-based cavity-enhanced polarimetric schemes as it relies on the determination of the polarization-rotation frequency during a ring-down event generated by large intracavity polarization anisotropies. We present the principles of CW-CRDP and validate the applicability of this technique for measurement of the non-resonant Faraday effect in solid SiO$_2$ and CeF$_3$ and gaseous butane. We give a general analysis of the fundamental sensitivity limits for CRDP techniques and show how the presented frequency-based methodology alleviates the requirement for high finesse cavities to achieve high polarimetric sensitivities, and, thus, allows for the extension of cavity-based polarimetric schemes into different spectral regimes but most importantly renders the CW-CRDP methodology particularly suitable for robust portable polarimetric instrumentations.
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