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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 42, Iss. 24 — Aug. 20, 2003
  • pp: 4877–4882

Broadband, Continuous, and Fine-Tune Properties of External-Cavity Thermoelectric-Stabilized Mid-infrared Quantum-Cascade Lasers

Chuan Peng, Guipeng Luo, and Han Q. Le  »View Author Affiliations


Applied Optics, Vol. 42, Issue 24, pp. 4877-4882 (2003)
http://dx.doi.org/10.1364/AO.42.004877


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Abstract

Continuous, broad, and single-mode wavelength tuning of thermoelectrically cooled short-pulse quantum-cascade lasers is demonstrated with a combination of coarse grating tuning and fine phase tuning of the gain element. This approach overcomes the problem of a poor facet antireflection coating of the gain chip by shifting a Fabry-Perot longitudinal mode to coincide with the desired grating-selected wavelength. The 9-μm laser was tested with NH<sub>3</sub> gas absorption and showed fine frequency tuning at a rate of 31 MHz/step and a time-averaged linewidth of 500–750 MHz. The total tuning range was 9.08–9.36 μm and was limited only by the intrinsic gain of the device.

© 2003 Optical Society of America

OCIS Codes
(140.3070) Lasers and laser optics : Infrared and far-infrared lasers
(140.3600) Lasers and laser optics : Lasers, tunable
(300.6360) Spectroscopy : Spectroscopy, laser

Citation
Chuan Peng, Guipeng Luo, and Han Q. Le, "Broadband, Continuous, and Fine-Tune Properties of External-Cavity Thermoelectric-Stabilized Mid-infrared Quantum-Cascade Lasers," Appl. Opt. 42, 4877-4882 (2003)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-42-24-4877

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