Monolithic active mode locking of quantum cascade lasers

Roberto Paiella, Federico Capasso, Claire Gmachl, Harold Y. Hwang, Deborah L. Sivco, Albert L. Hutchinson, Alfred Y. Cho, H. C. Liu

Research output: Contribution to journalArticlepeer-review

65 Scopus citations


We demonstrate active mode locking of a high-speed 8 μm quantum cascade laser in a monolithic configuration, at a repetition rate of 11.6 GHz. Evidence of mode locking is obtained from the measured optical spectra and corresponding interferograms, as well as from the power spectra of the photocurrent detected with a fast quantum-well infrared photodetector. An estimate for the pulse width of approximately 5 ps is inferred from the experimental results. Mode-locked operation is observed up to a maximum temperature of over 120 K.

Original languageEnglish (US)
Pages (from-to)169-171
Number of pages3
JournalApplied Physics Letters
Issue number2
StatePublished - Jul 10 2000
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)


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