High-accuracy long distance measurements\nwith a mode-filtered frequency comb

0483524 - ÚPT 2018 RIV US eng J - Článek v odborném periodiku
Lešundák, Adam - Voigt, D. - Číp, Ondřej - van der Berg, M.
High-accuracy long distance measurements
with a mode-filtered frequency comb.
Optics Express. Roč. 25, č. 26 (2017), s. 32570-32580. ISSN 1094-4087
Grant CEP: GA ČR GB14-36681G; GA MŠMT(CZ) LO1212; GA MŠMT ED0017/01/01
Institucionální podpora: RVO:68081731
Klíčová slova: measurements * filtered frequency comb
Obor OECD: Optics (including laser optics and quantum optics)
Impakt faktor: 3.356, rok: 2017

Homodyne interferometry with a frequency comb as multi-wavelength source is a
powerful method to measure long distances with high accuracy. The measurement principle
requires that individual comb modes are spectrally resolved, making hundreds or thousands of
accurately known wavelengths available for interferometry. For this reason the method cannot be applied directly to frequency combs with a low repetition rate (e.g. 100 MHz), since the modes are too close to be resolved. In this paper we use cavity mode filtering to increasing the pulse repetition rate of a comb and we apply the filtered comb for mode-resolved absolute distance measurement. Mode-filtering takes place with a single Fabry-Pérot cavity in a Vernier
configuration, allowing to set mode spacings ranging from 10s of GHz to more than 100 GHz. Large mode-spacings significantly reduce the requirements on the resolution of the spectrometer. We demonstrate absolute long distance measurement with a mode-filtered frequency comb using
a simple array spectrometer for mode-resolved detection. Here a 1 GHz comb is used, that is converted into a 56 GHz comb by mode-filtering. A trade-off between non-ambiguity range and spectral resolution needs to be made when choosing a filter ratio. The pulse-to-pulse distance
after filtering is 5.3 mm in this case, so to overcome ambiguity a rough measurement with an accuracy of about 2.5 mm is required. We show that in comparison to a conventional counting interferometer an agreement within 0.5 .pí.m for distances up to 50 m is found. The presented
method may enable the field application of low-repetition rate frequency comb lasers, like fiber lasers, for multi-wavelength homodyne interferometry. It relaxes the requirements on the spectral resolution, allowing for simple grating spectrometers as detector.
Trvalý link: http://hdl.handle.net/11104/0278790