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No Access Submitted: 28 May 2007 Accepted: 21 August 2007 Published Online: 17 September 2007

  • Tunable terahertz quantum cascade lasers with an external cavity

Appl. Phys. Lett. 91, 121104 (2007); https://doi.org/10.1063/1.2786587
Jihua Xu
  • NEST CNR-INFM and Scuola Normale Superiore, Piazza dei Cavalieri 7, 56126 Pisa, Italy
    • Joel M. Hensley and D. B. Fenner
  • Physical Sciences, Inc., 20 New England Business Center, Andover, Massachusetts 01810, USA
    • Richard P. Green, Lukas Mahler, and Alessandro Tredicuccia)
  • NEST CNR-INFM and Scuola Normale Superiore, Piazza dei Cavalieri 7, 56126 Pisa, Italy
    • Mark G. Allen
  • Physical Sciences, Inc., 20 New England Business Center, Andover, Massachusetts 01810, USA
    • Fabio Beltram
  • NEST CNR-INFM and Scuola Normale Superiore, Piazza dei Cavalieri 7, 56126 Pisa, Italy
    • Harvey E. Beere and David A. Ritchie
  • Cavendish Laboratory, University of Cambridge, J J Thomson Avenue, Cambridge CB3 0HE, United Kingdom
    • more...View Affiliations
    View Contributors
    • 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
    ABSTRACT
    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 3cm−1 is obtained near the center frequency of 4.8THz (∼160cm−1), and continuous mode-hop-free tuning is observed over ∼ 0.4cm−1, 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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    1. © 2007 American Institute of Physics.

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