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Optics Letters

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  • Vol. 27, Iss. 24 — Dec. 15, 2002
  • pp: 2164–2166

Frequency stabilization of quantum-cascade lasers by use of optical cavities

Matthew S. Taubman, Tanya L. Myers, Bret D. Cannon, Richard M. Williams, Federico Capasso, Claire Gmachl, Deborah L. Sivco, and Alfred Y. Cho  »View Author Affiliations


Optics Letters, Vol. 27, Issue 24, pp. 2164-2166 (2002)
http://dx.doi.org/10.1364/OL.27.002164


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Abstract

We report a heterodyne beat with a linewidth of 5.6±0.6 Hz between two cavity-stabilized quantum-cascade lasers operating at 8.5 µm . We also present a technique for measuring this beat that avoids the need for extreme isolation of the optical cavities from the environment, that of employing a third servo loop with low bandwidth to force one cavity to track the slow drifts and low-frequency fluctuations of the other. Although it is not fully independent, this technique greatly facilitates heterodyne beat measurements for evaluating the performance of cavity-locked lasers above the bandwidth of the third loop.

© 2002 Optical Society of America

OCIS Codes
(000.2170) General : Equipment and techniques
(120.4820) Instrumentation, measurement, and metrology : Optical systems
(140.3070) Lasers and laser optics : Infrared and far-infrared lasers
(140.5960) Lasers and laser optics : Semiconductor lasers

Citation
Matthew S. Taubman, Tanya L. Myers, Bret D. Cannon, Richard M. Williams, Federico Capasso, Claire Gmachl, Deborah L. Sivco, and Alfred Y. Cho, "Frequency stabilization of quantum-cascade lasers by use of optical cavities," Opt. Lett. 27, 2164-2166 (2002)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-27-24-2164


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