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Theoretical simulation of a polarization modulator based on mechanical rotation of a polarizing element

机译:基于偏振元件机械旋转的偏振调制器的理论仿真

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The properties of three alternative designs for a polarization modulator of potential use for the measurement of vibrational circular dichroism (VCD) are evaluated and compared by use of Mueller calculus. The analysis shows that the combination of a fixed polarizer plus either a photoelastic modulator or a rotating quarter-wave plate possesses nearly the same capability for generation of time-varying, circularly polarized light. However, a modulator composed of a rotating polarizer plus a fixed birefringent plate entails considerable theoretical and experimental difficulties for use in the measurement of VCD spectra. While VCD spectra obtained with the rotating devices can be calibrated in the same manner as spectra obtained with a photoelastic modulator, Mueller analysis shows that the form of the resultant calibration signal will have a different shape. The relevant expressions for VCD and linear dichroism as well as the calibration signals are presented, and consequences for practical realization of these experiments are discussed. # 1997 Optical Society of America
机译:通过使用Mueller演算评估并比较了可能用于测量振动圆二色性(VCD)的偏振调制器的三种替代设计的性能。分析表明,固定偏振器与光弹性调制器或旋转四分之一波片的组合具有几乎相同的产生时变圆偏振光的能力。然而,由旋转偏振器加上固定的双折射板组成的调制器在用于VCD光谱的测量中需要相当大的理论和实验困难。用旋转设备获得的VCD光谱可以用与光弹性调制器获得的光谱相同的方式进行校准,但Mueller分析表明,所得校准信号的形式将具有不同的形状。给出了VCD和线性二向色性的相关表达式以及校准信号,并讨论了这些实验的实际实现结果。 #1997美国眼镜学会

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