We present a compact polarimeter, which can perform sensitive measurements of optical rotation in vapor. The operation of the polarimeter is based on a Cavity Ring-Down scheme which employs two signal reversals, which increase sensitivity and reduce noise, allowing the realization of sensitive measurements in the presence of spurious birefringence. We describe the operation of the polarimeter, give the basic equations for the signal analysis and retrieval of optical rotation angle, and present measurements that demonstrate a sensitivity of ∼80 μ deg/pass.

中文翻译：

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使用紧凑型腔衰荡旋光仪进行气相光学活性测量

我们提出了一种紧凑的旋光仪，它可以对蒸气中的旋光度进行灵敏的测量。偏振计的操作基于腔衰荡方案，该方案采用两个信号反转，从而提高了灵敏度并降低了噪声，从而在存在伪双折射的情况下实现了灵敏的测量。我们描述了旋光仪的操作，给出了信号分析和旋光角恢复的基本方程式，并给出了测量结果，这些测量结果证明了〜80μdeg / pass的灵敏度。