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Synthetic wavelength interferometry of an optical frequency comb for absolute distance measurement.

ABSTRACT: We present a synthetic-wavelength based heterodyne interferometer of optical frequency combs with wide consecutive measurement range for absolute distance measurement. The synthetic wavelength is derived from two wavelengths obtained by two band-pass filters. The interferometric phase of the synthetic wavelength is used as a marker for the pulse-to-pulse alignment, which greatly improves the accuracy of traditional peak finding method. The consecutive measurement range is enlarged by using long fiber to increase the path length difference of the reference and measurement arms. The length of the long fiber is stabilized according to the interferometric phase of a CW laser. The experimental results show the present system can realize an accuracy of 75?nm in 350?mm consecutive measurement range.

SUBMITTER: Wu G

PROVIDER: S-EPMC5847515 | biostudies-other | 2018 Mar

REPOSITORIES: biostudies-other

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Synthetic wavelength interferometry of an optical frequency comb for absolute distance measurement.

Wu Guanhao G Liao Lei L Xiong Shilin S Li Guoyuan G Cai Zhijian Z Zhu Zebin Z

Scientific reports 20180312 1

We present a synthetic-wavelength based heterodyne interferometer of optical frequency combs with wide consecutive measurement range for absolute distance measurement. The synthetic wavelength is derived from two wavelengths obtained by two band-pass filters. The interferometric phase of the synthetic wavelength is used as a marker for the pulse-to-pulse alignment, which greatly improves the accuracy of traditional peak finding method. The consecutive measurement range is enlarged by using long ...[more]

PMID: 29531356

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