1 November 2002 Birefringence measurements by an electro-optic modulator using a new heterodyne scheme
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Abstract
A new method for measuring changes in birefringence (or retardation) by modulating an electro-optic (EO) modulator in a sine-wave signal is developed in a common-path interferometer (polarimeter). The standard heterodyne signal, therefore, can be formed with a new heterodyne scheme, and subsequently the phase shift regarding to changes in birefringence is demodulated by a lock-in amplifier or phase meter. As compared to the conventional techniques, this technique supplies an easier setup, wider modulated frequency, and therefore, a wider frequency response in a sensing system. Finally, the birefringence measurement based on an EO modulator and a new heterodyne scheme in a common-path interferometer is first demonstrated.
© (2002) Society of Photo-Optical Instrumentation Engineers (SPIE)
Yu-Lung Lo, Ping-Feng Hsu, "Birefringence measurements by an electro-optic modulator using a new heterodyne scheme," Optical Engineering 41(11), (1 November 2002). https://doi.org/10.1117/1.1512908 . Submission:
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