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Optics Letters

Optics Letters


  • Editor: Xi-Cheng Zhang
  • Vol. 39, Iss. 4 — Feb. 15, 2014
  • pp: 1038–1041

Suppression of thermal frequency noise in erbium-doped fiber random lasers

Bhavaye Saxena, Xiaoyi Bao, and Liang Chen  »View Author Affiliations

Optics Letters, Vol. 39, Issue 4, pp. 1038-1041 (2014)

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Frequency and intensity noise are characterized for erbium-doped fiber (EDF) random lasers based on Rayleigh distributed feedback mechanism. We propose a theoretical model for the frequency noise of such random lasers using the property of random phase modulations from multiple scattering points in ultralong fibers. We find that the Rayleigh feedback suppresses the noise at higher frequencies by introducing a Lorentzian envelope over the thermal frequency noise of a long fiber cavity. The theoretical model and measured frequency noise agree quantitatively with two fitting parameters. The random laser exhibits a noise level of 6Hz2/Hz at 2 kHz, which is lower than what is found in conventional narrow-linewidth EDF fiber lasers and nonplanar ring laser oscillators (NPROs) by a factor of 166 and 2, respectively. The frequency noise has a minimum value for an optimum length of the Rayleigh scattering fiber.

© 2014 Optical Society of America

OCIS Codes
(140.3500) Lasers and laser optics : Lasers, erbium
(140.3510) Lasers and laser optics : Lasers, fiber
(290.5870) Scattering : Scattering, Rayleigh
(060.3510) Fiber optics and optical communications : Lasers, fiber

ToC Category:
Lasers and Laser Optics

Original Manuscript: October 9, 2013
Revised Manuscript: December 28, 2013
Manuscript Accepted: January 13, 2014
Published: February 12, 2014

Bhavaye Saxena, Xiaoyi Bao, and Liang Chen, "Suppression of thermal frequency noise in erbium-doped fiber random lasers," Opt. Lett. 39, 1038-1041 (2014)

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