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Applied Optics

Applied Optics


  • Editor: Joseph N. Mait
  • Vol. 51, Iss. 20 — Jul. 10, 2012
  • pp: 4582–4588

Experimental validation of a simple approximation to determine the linewidth of a laser from its frequency noise spectrum

Nikola Bucalovic, Vladimir Dolgovskiy, Christian Schori, Pierre Thomann, Gianni Di Domenico, and Stéphane Schilt  »View Author Affiliations

Applied Optics, Vol. 51, Issue 20, pp. 4582-4588 (2012)

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Laser frequency fluctuations can be characterized either comprehensively by the frequency noise spectrum or in a simple but incomplete manner by the laser linewidth. A formal relation exists to calculate the linewidth from the frequency noise spectrum, but it is laborious to apply in practice. We recently proposed a much simpler geometrical approximation applicable to any arbitrary frequency noise spectrum. Here we present an experimental validation of this approximation using laser sources of different spectral characteristics. For each of them, we measured both the frequency noise spectrum to calculate the approximate linewidth and the actual linewidth directly. We observe a very good agreement between the approximate and directly measured linewidths over a broad range of values (from kilohertz to megahertz) and for significantly different laser line shapes.

© 2012 Optical Society of America

OCIS Codes
(120.0120) Instrumentation, measurement, and metrology : Instrumentation, measurement, and metrology
(140.3460) Lasers and laser optics : Lasers
(270.2500) Quantum optics : Fluctuations, relaxations, and noise
(300.3700) Spectroscopy : Linewidth

ToC Category:
Lasers and Laser Optics

Original Manuscript: April 4, 2012
Revised Manuscript: June 1, 2012
Manuscript Accepted: June 1, 2012
Published: July 2, 2012

Nikola Bucalovic, Vladimir Dolgovskiy, Christian Schori, Pierre Thomann, Gianni Di Domenico, and Stéphane Schilt, "Experimental validation of a simple approximation to determine the linewidth of a laser from its frequency noise spectrum," Appl. Opt. 51, 4582-4588 (2012)

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