High-accuracy long distance measurements with a mode-filtered frequency comb

High-accuracy long distance measurements with a mode-filtered frequency comb

Lesundak, A.
Voigt, D.
Cip, O.
van den Berg, S.

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-o 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 µm 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.

2015 Nano Technology
NI - Nano Instrumentation
TS - Technical Sciences
High Tech Systems & Materials
Industrial Innovation
Comb filters
Distance measurement
Fiber lasers
Interferometry
Pulse repetition rate
Spectral resolution
Spectrometers
Absolute distance measurement
Array spectrometer
Filtered frequencies
Frequency-comb laser
Grating spectrometers
Long distance measurement
Low repetition rate
Multi-wavelength source
Microwave filters

http://resolver.tudelft.nl/uuid:57da1f58-e4d9-4054-ae6f-e26c7b10e1a1

https://doi.org/10.1364/oe.25.032570

782923

Optical Society of America OSA

1094-4087

Optics Express, 25 (26), 32570-32580

article