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Optics Letters

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  • Vol. 29, Iss. 14 — Jul. 15, 2004
  • pp: 1632–1634

Heterodyne mixing of two far-infrared quantum cascade lasers by use of a point-contact Schottky diode

S. Barbieri, J. Alton, H. E. Beere, E. H. Linfield, D. A. Ritchie, S. Withington, G. Scalari, L. Ajili, and J. Faist  »View Author Affiliations


Optics Letters, Vol. 29, Issue 14, pp. 1632-1634 (2004)
http://dx.doi.org/10.1364/OL.29.001632


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Abstract

We demonstrate heterodyne mixing of two free-running, multimode, 3.3-THz quantum cascade lasers by use of a point-contact Schottky diode. By temperature tuning the emission wavelength of one laser, a difference frequency signal spanning the 2–4-GHz range is obtained, with a signal-to-noise ratio of 30 dB. The frequency of the heterodyne signal is subject to random fluctuations of a few megahertz, principally from instabilities in the temperatures of the devices. From single-shot measurements we derive an instantaneous linewidth for a single Fabry–Perot mode of 20 kHz, corresponding to an integration time of 3.6 ms.

© 2004 Optical Society of America

OCIS Codes
(040.2840) Detectors : Heterodyne
(140.3070) Lasers and laser optics : Infrared and far-infrared lasers
(140.5960) Lasers and laser optics : Semiconductor lasers
(260.3090) Physical optics : Infrared, far
(300.3700) Spectroscopy : Linewidth

Citation
S. Barbieri, J. Alton, H. E. Beere, E. H. Linfield, D. A. Ritchie, S. Withington, G. Scalari, L. Ajili, and J. Faist, "Heterodyne mixing of two far-infrared quantum cascade lasers by use of a point-contact Schottky diode," Opt. Lett. 29, 1632-1634 (2004)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-29-14-1632


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References

  1. R. Köhler, A. Tredicucci, F. Beltram, H. E. Beere, E. H. Linfield, A. G. Davies, D. A. Ritchie, R. Iotti, and F. Rossi, Nature 417, 156 (2002).
  2. G. Scalari, L. Ajili, D. Hofstetter, M. Beck, J. Faist, H. E. Beere, E. H. Linfield, D. A. Ritchie, and A. G. Davies, Appl. Phys. Lett. 82, 3165 (2003).
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  7. The mixer is manufactured by Farran Technology, Ltd. [Model CM(X)-5]. For technical specifications see http://www.farran.com.
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  9. The frequency shift owing to the slightly different currents is negligible.
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  11. The fact that, compared with the main part of Fig. f3, only one line is present in a window of 2 GHz, is a result of the random nature of the fluctuations.
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  14. Sometimes, if the optical path was momentarily blocked, one of the difference frequency lines would disappear and remain missing even after the blockage had been removed. The blockage could then be momentarily reinserted, and then after its removal the line would reappear.
  15. A. Tredicucci, Scuola Normale Superiore, Pisa, Italy (personal communication, March 2004).

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