11 February 2011 Instantaneous coherence length measurement of a swept laser source using a Mach-Zehnder interferometer
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Abstract
We present a measurement method which is capable of measuring the instantaneous coherence length as a function of the wavelength while the source is working at its full sweep rate. The measurement principle is based on the dynamic decrease of fringe contrast as a function of the optical path difference. The measurement setup consists of a free-space Mach-Zehnder interferometer with a variable optical path difference. We present results for instantaneous coherence lengths in a range from 0 mm to 50 mm with a mean standard deviation of 0.42 mm at sweep rates of up to 120 kHz.
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Tim von Niederhäusern, Christoph Meier, Marcus Duelk, Philipp Vorreau, "Instantaneous coherence length measurement of a swept laser source using a Mach-Zehnder interferometer", Proc. SPIE 7889, Optical Coherence Tomography and Coherence Domain Optical Methods in Biomedicine XV, 78892R (11 February 2011); doi: 10.1117/12.873769; https://doi.org/10.1117/12.873769
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