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 journalArticlepeer-review

66 Scopus citations


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
Issue number24
StatePublished - Dec 15 2002
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics


Dive into the research topics of 'Frequency stabilization of quantum-cascade lasers by use of optical cavities'. Together they form a unique fingerprint.

Cite this