Transient response in high-resolution Brillouin-based distributed sensing using probe pulses shorter than the acoustic relaxation time

V. Lecoeuche, David J. Webb, C.N. Pannell, David A. Jackson

Research output: Contribution to journalArticlepeer-review

Abstract

We perform numerical simulations on a model describing a Brillouin-based temperature and strain sensor, testing its response when it is probed with relatively short pulses. Experimental results were recently published [e.g., Opt. Lett. 24, 510 (1999)] that showed a broadening of the Brillouin loss curve when the probe pulse duration is reduced, followed by a sudden and rather surprising reduction of the linewidth when the pulse duration gets shorter than the acoustic relaxation time. Our study reveals the processes responsible for this behavior. We give a clear physical insight into the problem, allowing us to define the best experimental conditions required for one to take the advantage of this effect.
Original languageEnglish
Pages (from-to)156-158
Number of pages3
JournalOptics Letters
Volume25
Issue number3
DOIs
Publication statusPublished - 1 Feb 2000

Bibliographical note

© 2000 Optical Society of America

Keywords

  • Brillouin-based temperature
  • strain sensor
  • short pulses
  • linewidth
  • pulse duration
  • acoustic relaxation time

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