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Proceedings Paper • Open Access

Technique for long and absolute distance measurement based on laser pulse repetition frequency sweeping
Author(s): D. Castro Alves; Manuel Abreu; A. Cabral; Michael Jost; J.M. Rebordão

Paper Abstract

In this work we present a technique to perform long and absolute distance measurements based on mode-locked diode lasers. Using a Michelson interferometer, it is possible to produce an optical cross-correlation between laser pulses of the reference arm with the pulses from the measurement arm, adjusting externally their degree of overlap either changing the pulse repetition frequency (PRF) or the position of the reference arm mirror for two (or more) fixed frequencies. The correlation of the travelling pulses for precision distance measurements relies on ultra-short pulse durations, as the uncertainty associated to the method is dependent on the laser pulse width as well as on a highly stable PRF.

Mode-locked Diode lasers are a very appealing technology for its inherent characteristics, associated to compactness, size and efficiency, constituting a positive trade-off with regard to other mode-locked laser sources. Nevertheless, main current drawback is the non-availability of frequency-stable laser diodes. The laser used is a monolithic mode-locked semiconductor quantum-dot (QD) laser. The laser PRF is locked to an external stabilized RF reference. In this work we will present some of the preliminary results and discuss the importance of the requirements related to laser PRF stability in the final metrology system accuracy.

Paper Details

Date Published: 20 November 2017
PDF: 9 pages
Proc. SPIE 10564, International Conference on Space Optics — ICSO 2012, 1056421 (20 November 2017); doi: 10.1117/12.2309077
Show Author Affiliations
D. Castro Alves, Univ. of Lisbon (Portugal)
Manuel Abreu, Univ. of Lisbon (Portugal)
A. Cabral, Univ. of Lisbon (Portugal)
Michael Jost, European Space Research and Technology Ctr. (Netherlands)
J.M. Rebordão, Univ. of Lisbon (Portugal)

Published in SPIE Proceedings Vol. 10564:
International Conference on Space Optics — ICSO 2012
Bruno Cugny; Errico Armandillo; Nikos Karafolas, Editor(s)

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