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Optics Letters

Optics Letters

| RAPID, SHORT PUBLICATIONS ON THE LATEST IN OPTICAL DISCOVERIES

  • Editor: Alan E. Willner
  • Vol. 34, Iss. 19 — Oct. 1, 2009
  • pp: 2958–2960

Phase locking of a 2.7 THz quantum cascade laser to a microwave reference

P. Khosropanah, A. Baryshev, W. Zhang, W. Jellema, J. N. Hovenier, J. R. Gao, T. M. Klapwijk, D. G. Paveliev, B. S. Williams, S. Kumar, Q. Hu, J. L. Reno, B. Klein, and J. L. Hesler  »View Author Affiliations


Optics Letters, Vol. 34, Issue 19, pp. 2958-2960 (2009)
http://dx.doi.org/10.1364/OL.34.002958


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Abstract

We demonstrate the phase locking of a 2.7 THz metal–metal waveguide quantum cascade laser (QCL) to an external microwave signal. The reference is the 15th harmonic, generated by a semiconductor superlattice nonlinear device, of a signal at 182 GHz, which itself is generated by a multiplier chain ( × 12 ) from a microwave synthesizer at 15   GHz . Both laser and reference radiations are coupled into a bolometer mixer, resulting in a beat signal, which is fed into a phase-lock loop. The spectral analysis of the beat signal confirms that the QCL is phase locked. This result opens the possibility to extend heterodyne interferometers into the far-infrared range.

© 2009 Optical Society of America

OCIS Codes
(300.6310) Spectroscopy : Spectroscopy, heterodyne
(350.1270) Other areas of optics : Astronomy and astrophysics
(040.2235) Detectors : Far infrared or terahertz
(300.6495) Spectroscopy : Spectroscopy, teraherz
(250.5590) Optoelectronics : Quantum-well, -wire and -dot devices

ToC Category:
Spectroscopy

History
Original Manuscript: July 6, 2009
Revised Manuscript: August 25, 2009
Manuscript Accepted: August 26, 2009
Published: September 24, 2009

Citation
P. Khosropanah, A. Baryshev, W. Zhang, W. Jellema, J. N. Hovenier, J. R. Gao, T. M. Klapwijk, D. G. Paveliev, B. S. Williams, S. Kumar, Q. Hu, J. L. Reno, B. Klein, and J. L. Hesler, "Phase locking of a 2.7 THz quantum cascade laser to a microwave reference," Opt. Lett. 34, 2958-2960 (2009)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-34-19-2958

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