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Proceedings Paper

Sub-ppm absolute distance measurements using an optical frequency comb generated by a conventional dual-drive Mach-Zehnder modulator
Author(s): S. Le Floch; M. Llera; Y. Salvadé
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Paper Abstract

A simple technique to generate an optical frequency comb, based on a conventional dual-drive Mach-Zehnder intensity modulator, has been used as optical source for a high accuracy distance measurement in an interferometric set-up. The modulator has been driven by a direct-digital synthesizer that is able to deliver a pure ramp in frequency between 13 GHz and 14 GHz. We have obtained about 15 modes, corresponding to a spectral span of 200 GHz. This optical signal, launched in a Michelson interferometric set-up, allowed performing absolute distance measurement by sweeping the radio-frequency of the direct digital synthesizer. Measurements have been compared to a standard, which was a mode-locked femtosecond laser along with a counting interferometer. Absolute distance measurements over a range of 1 to 24 meters gave an accuracy of about ± 10 microns, with a repeatability of ± 5 microns, corresponding to a sub-ppm absolute distance measurement.

Paper Details

Date Published: 27 May 2011
PDF: 7 pages
Proc. SPIE 8082, Optical Measurement Systems for Industrial Inspection VII, 80823S (27 May 2011); doi: 10.1117/12.890935
Show Author Affiliations
S. Le Floch, Haute Ecole Arc Ingénierie Siège (Switzerland)
M. Llera, Haute Ecole Arc Ingénierie Siège (Switzerland)
Y. Salvadé, Haute Ecole Arc Ingénierie Siège (Switzerland)


Published in SPIE Proceedings Vol. 8082:
Optical Measurement Systems for Industrial Inspection VII
Peter H. Lehmann; Wolfgang Osten; Kay Gastinger, Editor(s)

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