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, Alfred Y. Cho

Research output: Contribution to journalArticle

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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.

Original languageEnglish (US)
Pages (from-to)2164-2166
Number of pages3
JournalOptics Letters
Volume27
Issue number24
DOIs
StatePublished - Dec 15 2002
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics

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  • Cite this

    Taubman, M. S., Myers, T. L., Cannon, B. D., Williams, R. M., Capasso, F., Gmachl, C., Sivco, D. L., & Cho, A. Y. (2002). Frequency stabilization of quantum-cascade lasers by use of optical cavities. Optics Letters, 27(24), 2164-2166. https://doi.org/10.1364/OL.27.002164