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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 7 — Mar. 26, 2012
  • pp: 6851–6859

Temperature dependence of the frequency noise in a mid-IR DFB quantum cascade laser from cryogenic to room temperature

Lionel Tombez, Stéphane Schilt, Joab Di Francesco, Pierre Thomann, and Daniel Hofstetter  »View Author Affiliations

Optics Express, Vol. 20, Issue 7, pp. 6851-6859 (2012)

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We report on the measurement of the frequency noise power spectral density in a distributed feedback quantum cascade laser over a wide temperature range, from 128 K to 303 K. As a function of the device temperature, we show that the frequency noise behavior is characterized by two different regimes separated by a steep transition at ≈200 K. While the frequency noise is nearly unchanged above 200 K, it drastically increases at lower temperature with an exponential dependence. We also show that this increase is entirely induced by current noise intrinsic to the device. In contrast to earlier publications, a single laser is used here in a wide temperature range allowing the direct assessment of the temperature dependence of the frequency noise.

© 2012 OSA

OCIS Codes
(270.2500) Quantum optics : Fluctuations, relaxations, and noise
(290.3700) Scattering : Linewidth
(140.5965) Lasers and laser optics : Semiconductor lasers, quantum cascade

ToC Category:
Lasers and Laser Optics

Original Manuscript: February 8, 2012
Revised Manuscript: February 25, 2012
Manuscript Accepted: March 7, 2012
Published: March 12, 2012

Lionel Tombez, Stéphane Schilt, Joab Di Francesco, Pierre Thomann, and Daniel Hofstetter, "Temperature dependence of the frequency noise in a mid-IR DFB quantum cascade laser from cryogenic to room temperature," Opt. Express 20, 6851-6859 (2012)

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