No Access Submitted: 28 May 2007 Accepted: 21 August 2007 Published Online: 17 September 2007
Appl. Phys. Lett. 91, 121104 (2007);
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  • Jihua Xu
  • Joel M. Hensley
  • D. B. Fenner
  • Richard P. Green
  • Lukas Mahler
  • Alessandro Tredicucci
  • Mark G. Allen
  • Fabio Beltram
  • Harvey E. Beere
  • David A. Ritchie
Tunable quantum cascade lasers operating in the terahertz frequency range are demonstrated. By using an external cavity based on the reflection from a movable mirror, both broad and fine tuning of the frequency are achieved by varying the cavity length. Coarse tuning up to 3cm1 is obtained near the center frequency of 4.8THz (160cm1), and continuous mode-hop-free tuning is observed over 0.4cm1, nearly corresponding to the cavity free spectral range.
This work was supported in part by the European Commission through the IP project Teranova and the Marie Curie RTN Poise, and by NASA under Contract No. NNA05BE72C. Useful discussions with J. Faist are gratefully acknowledged.
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