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Optics Letters

Optics Letters


  • Editor: Alan E. Willner
  • Vol. 38, Iss. 23 — Dec. 1, 2013
  • pp: 5079–5082

Active linewidth-narrowing of a mid-infrared quantum cascade laser without optical reference

L. Tombez, S. Schilt, D. Hofstetter, and T. Südmeyer  »View Author Affiliations

Optics Letters, Vol. 38, Issue 23, pp. 5079-5082 (2013)

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We report on a technique for frequency noise reduction and linewidth-narrowing of a distributed-feedback mid-IR quantum cascade laser (QCL) that does not involve any optical frequency reference. The voltage fluctuations across the QCL are sensed, amplified and fed back to the temperature of the QCL at a fast rate using a near-IR laser illuminating the top of the QCL chip. A locking bandwidth of 300 kHz and a reduction of the frequency noise power spectral density by a factor of 10 with respect to the free-running laser are achieved. From 2 MHz for the free-running QCL, the linewidth is narrowed below 700 kHz (10 ms observation time).

© 2013 Optical Society of America

OCIS Codes
(290.3700) Scattering : Linewidth
(140.5965) Lasers and laser optics : Semiconductor lasers, quantum cascade

ToC Category:

Original Manuscript: September 17, 2013
Revised Manuscript: October 25, 2013
Manuscript Accepted: October 30, 2013
Published: November 25, 2013

L. Tombez, S. Schilt, D. Hofstetter, and T. Südmeyer, "Active linewidth-narrowing of a mid-infrared quantum cascade laser without optical reference," Opt. Lett. 38, 5079-5082 (2013)

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