Wavelength shift determination using a dual-path heterodyne Mach-Zehnder interferometer |
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Authors: | Shyh-Tsong Lin Yan-Ru Cheng |
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Institution: | Department of Electro-optical Engineering, National Taipei University of Technology, 1, Sec. 3, Chung-Hsiao East Road, Taipei 10608, Taiwan |
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Abstract: | This paper introduces a dual-path heterodyne Mach-Zehnder interferometer adopted for wavelength shift determinations. In this interferometer, two parallel incident beams are separated into two interference pairs which are then recombined to generate two interference signals. A parallel plate is placed on the path of one wave of an interference pair, so the phase difference of the interference signals is a function of the plate and beam wavelength, and the interferometer is thus able to determine the wavelength shift of the incident beam. A setup constructed to realize the proposed interferometer is described, it shows that the interferometer has a resolution up to 1.1 × 10−10 (λ2/nm), and the experimental results of applying this setup not only agree the validity of the interferometer but also indicate that the interferometer has a stability of 6.5 × 10−10 (λ2/nm). |
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