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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 11 — May. 21, 2012
  • pp: 12432–12442

Frequency characterization of a swept- and fixed-wavelength external-cavity quantum cascade laser by use of a frequency comb

Kevin Knabe, Paul A. Williams, Fabrizio R. Giorgetta, Chris M. Armacost, Sam Crivello, Michael B. Radunsky, and Nathan R. Newbury  »View Author Affiliations


Optics Express, Vol. 20, Issue 11, pp. 12432-12442 (2012)
http://dx.doi.org/10.1364/OE.20.012432


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Abstract

The instantaneous optical frequency of an external-cavity quantum cascade laser (QCL) is characterized by comparison to a near-infrared frequency comb. Fluctuations in the instantaneous optical frequency are analyzed to determine the frequency-noise power spectral density for the external-cavity QCL both during fixed-wavelength and swept-wavelength operation. The noise performance of a near-infrared external-cavity diode laser is measured for comparison. In addition to providing basic frequency metrology of external-cavity QCLs, this comb-calibrated swept QCL system can be applied to rapid, precise broadband spectroscopy in the mid-infrared spectral region.

© 2012 OSA

OCIS Codes
(140.4050) Lasers and laser optics : Mode-locked lasers
(300.6390) Spectroscopy : Spectroscopy, molecular
(190.4223) Nonlinear optics : Nonlinear wave mixing

ToC Category:
Lasers and Laser Optics

History
Original Manuscript: April 9, 2012
Revised Manuscript: April 30, 2012
Manuscript Accepted: May 4, 2012
Published: May 16, 2012

Citation
Kevin Knabe, Paul A. Williams, Fabrizio R. Giorgetta, Chris M. Armacost, Sam Crivello, Michael B. Radunsky, and Nathan R. Newbury, "Frequency characterization of a swept- and fixed-wavelength external-cavity quantum cascade laser by use of a frequency comb," Opt. Express 20, 12432-12442 (2012)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-20-11-12432


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