Mode-resolved frequency comb interferometry for high-accuracy long distance measurement

Mode-resolved frequency comb interferometry for high-accuracy long distance measurement

Van den Berg, S.A.
Van Eldik, S.
Bhattacharya, N.

Applied Sciences

ImPhys/Imaging Physics

2015-09-30

Optical frequency combs have developed into powerful tools for distance metrology. In this paper we demonstrate absolute long distance measurement using a single femtosecond frequency comb laser as a multi-wavelength source. By applying a high-resolution spectrometer based on a virtually imaged phased array, the frequency comb modes are resolved spectrally to the level of an individual mode. Having the frequency comb stabilized against an atomic clock, thousands of accurately known wavelengths are available for interferometry. From the spectrally resolved output of a Michelson interferometer a distance is derived. The presented measurement method combines spectral interferometry, white light interferometry and multi-wavelength interferometry in a single scheme. Comparison with a fringe counting laser interferometer shows an agreement within <10?8 for a distance of 50?m.

http://resolver.tudelft.nl/uuid:90334cf6-d1ec-406e-ad98-74b5829018b0

Nature Publishing Group

2045-2322

https://doi.org/10.1038/srep14661

Scientific Reports, 5, 2015

Institutional Repository

journal article

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