Kilohertz linewidth from frequency-stabilized mid-infrared quantum cascade lasers

Richard M. Williams, James F. Kelly, John S. Hartman, Steven W. Sharpe, Matthew S. Taubman, John L. Hall, Federico Capasso, Claire Gmachl, Deborah L. Sivco, James N. Baillargeon, Alfred Y. Cho

Research output: Contribution to journalArticlepeer-review

115 Scopus citations


Frequency stabilization of mid-IR quantum cascade (QC) lasers to the kilohertz level has been accomplished by use of electronic servo techniques. With this active feedback, an 8.5-μm QC distributed-feedback laser is locked to the side of a rovibrational resonance of nitrous oxide (N2O) at 1176.61 cm-1. A stabilized frequency-noise spectral density of 42 Hz/√Hz has been measured at 100 kHz; the calculated laser linewidth is 12 kHz.

Original languageEnglish (US)
Pages (from-to)1844-1846
Number of pages3
JournalOptics Letters
Issue number24
StatePublished - Dec 15 1999
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics


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