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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 21 — Oct. 21, 2013
  • pp: 24630–24635

A method for characterizing the stability of light sources

Tiziano Sanvito, Francesca Zocca, Alberto Pullia, and Marco Potenza  »View Author Affiliations

Optics Express, Vol. 21, Issue 21, pp. 24630-24635 (2013)

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We describe a method for measuring small fluctuations in the intensity of a laser source with a resolution of 10−4. The current signal generated by a PIN diode is passed to a front-end electronics that discriminates the AC from the DC components, which are physically separated and propagated along circuit paths with different gains. The gain long the AC signal path is set one order of magnitude larger than that along the DC signal path in such a way to optimize the measurement dynamic range. We then derive the relative fluctuation signal by normalizing the input-referred AC signal component to its input-referred DC counterpart. In this way the fluctuation of the optical signal waveform relative to the mean power of the laser is obtained. A “Noise-Scattering-Pattern method” and a “Signal-Power-Spectrum method” are then used to analyze the intensity fluctuations from three different solid-state lasers. This is a powerful tool for the characterization of the intensity stability of lasers. Applications are discussed.

© 2013 OSA

OCIS Codes
(120.0120) Instrumentation, measurement, and metrology : Instrumentation, measurement, and metrology
(140.0140) Lasers and laser optics : Lasers and laser optics

ToC Category:
Instrumentation, Measurement, and Metrology

Original Manuscript: January 30, 2013
Revised Manuscript: March 13, 2013
Manuscript Accepted: March 13, 2013
Published: October 8, 2013

Tiziano Sanvito, Francesca Zocca, Alberto Pullia, and Marco Potenza, "A method for characterizing the stability of light sources," Opt. Express 21, 24630-24635 (2013)

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