Double-looped Mach-Zehnder interferometer for achieving multiple ring-down interferograms

We put forward a double-looped Mach-Zehnder interferometer for acquiring continuous ring-down interferograms with two fiber-loop cavities with slightly different optical path lengths. Each group of pulses through the sample and reference loops creates a ring-down pulse train with equal time interval...

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Bibliographic Details
Published inOptics express Vol. 22; no. 23; pp. 28353 - 28362
Main Authors Kim, Jin Hwan, Kwon, Won Sik, Lee, Hyub, Kim, Kyung-Soo, Kim, Soohyun
Format Journal Article
LanguageEnglish
Published United States 17.11.2014
Subjects
Equipment Design
Interferometry - instrumentation
Refractometry - instrumentation
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Summary:We put forward a double-looped Mach-Zehnder interferometer for acquiring continuous ring-down interferograms with two fiber-loop cavities with slightly different optical path lengths. Each group of pulses through the sample and reference loops creates a ring-down pulse train with equal time intervals in Vernier fashion, and interferes with each other to produce multiple ring-down interferograms successively by scanning of a delay line. The system requires a scanning range of only a few millimeters to obtain multiple ring-down interferograms. In a proof-of-concept demonstration, the intrinsic losses of two loops are estimated. The measured combined-loss of both loops is compared to the sum of the loop losses measured separately with a conventional fiber-loop ring-down system. The result obtained using the proposed system exhibits a difference of only 0.06 dB with that of the reference system.
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ISSN:1094-4087
1094-4087
DOI:10.1364/OE.22.028353