Linear Birefringence Measurement with a Differential-phase Optical Heterodyne Polarimeter.

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  • Teng Hui-Kang
    Institute of Electronic Engineering, National Taiwan University of Science and Technology, Taipei, Taiwan, 100, R.O.C.
  • Chou Chien
    Institute of Radiological Science, National Yang-Ming University, Pei-tou, Taipei, Taiwan, 112, R.O.C.
  • Chang Chia-Nan
    Institute of Electronic Engineering, National Taiwan University of Science and Technology, Taipei, Taiwan, 100, R.O.C.
  • Lyu Chung-Wei
    Institute of Radiological Science, National Yang-Ming University, Pei-tou, Taipei, Taiwan, 112, R.O.C.
  • Huang Yue-Chuan
    Chung Shang Institute of Science and Technology, P. O. Box 90008-15-1, Lung-tan, Tao-yuan, Taiwan, 325, R.O.C.

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  • Linear Birefingence Measurement with a Differential-phase Optical Heterodyne Polarimeter

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Abstract

To measure the linear birefringence of a quartz crystal, an optical heterodyne ring interferometer associated with a differential phase detection technique is proposed. The differential phase detection performs a common noise rejection similar to a balanced detector for noise reduction. The differential phase detection also plays the role of a phase modulation to amplitude modulation (AM) converter to decode the phase difference between two equal amplitude input heterodyne signals with the same carrier frequency. In this study, a quartz Babinet compensator is used as a test sample and the linear birefringence of the quartz can be measured in terms of the magnitude of an AM signal from a differential amplifier. In comparison with conventional methods, a wider dynamic range and better accuracy of the linear birefringence measurement of a crystal in Babinet compensator geometry are realized. From the experimental results, the linear birefringence of quartz with accuracy of 10-5 order is obtained. The error analysis is also presented.

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