Instantaneous coherence length measurement of a swept laser source using a Mach-Zehnder interferometer

Tim von Niederhäusern; Christoph Meier; Marcus Duelk; Philipp Vorreau

doi:10.1117/12.873769

11 February 2011 Instantaneous coherence length measurement of a swept laser source using a Mach-Zehnder interferometer

Tim von Niederhäusern, Christoph Meier, Marcus Duelk, Philipp Vorreau

Proceedings Volume 7889, Optical Coherence Tomography and Coherence Domain Optical Methods in Biomedicine XV; 78892R (2011) https://doi.org/10.1117/12.873769
Event: SPIE BiOS, 2011, San Francisco, California, United States

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.

Citation Download Citation

Tim von Niederhäusern, Christoph Meier, Marcus Duelk, and 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); https://doi.org/10.1117/12.873769

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