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Optics Letters

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  • Vol. 30, Iss. 14 — Jul. 15, 2005
  • pp: 1837–1839

Frequency and phase-lock control of a 3 THz quantum cascade laser

A. L. Betz, R. T. Boreiko, B. S. Williams, S. Kumar, Q. Hu, and J. L. Reno  »View Author Affiliations


Optics Letters, Vol. 30, Issue 14, pp. 1837-1839 (2005)
http://dx.doi.org/10.1364/OL.30.001837


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Abstract

We have locked the frequency of a 3 THz quantum cascade laser (QCL) to that of a far-infrared gas laser with a tunable microwave offset frequency. The locked QCL line shape is essentially Gaussian, with linewidths of 65 and 141 kHz at the -3 and -10 dB levels, respectively. The lock condition can be maintained indefinitely, without requiring temperature or bias current regulation of the QCL other than that provided by the lock error signal. The result demonstrates that a terahertz QCL can be frequency controlled with 1-part-in-108 accuracy, which is a factor of 100 better than that needed for a local oscillator in a heterodyne receiver for atmospheric and astronomic spectroscopy.

© 2005 Optical Society of America

OCIS Codes
(140.3070) Lasers and laser optics : Infrared and far-infrared lasers
(140.5960) Lasers and laser optics : Semiconductor lasers
(300.6310) Spectroscopy : Spectroscopy, heterodyne

Citation
A. L. Betz, R. T. Boreiko, B. S. Williams, S. Kumar, Q. Hu, and J. L. Reno, "Frequency and phase-lock control of a 3 THz quantum cascade laser," Opt. Lett. 30, 1837-1839 (2005)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-30-14-1837


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References

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