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Optics Letters

Optics Letters

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  • Vol. 28, Iss. 9 — May. 1, 2003
  • pp: 704–706

Free-running 9.1-μm distributed-feedback quantum cascade laser linewidth measurement by heterodyning with a C 18O2 laser

D. Weidmann, L. Joly, V. Parpillon, D. Courtois, Y. Bonetti, T. Aellen, M. Beck, J. Faist, and D. Hofstetter  »View Author Affiliations


Optics Letters, Vol. 28, Issue 9, pp. 704-706 (2003)
http://dx.doi.org/10.1364/OL.28.000704


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Abstract

We report spectral linewidth measurements of a 9.1-μm distributed-feedback quantum cascade laser (QCL). The free-running QCL beam was mixed with a waveguide isotopic C18O2 laser onto a high-speed HgCdTe photomixer, and beat notes were recorded from a radio-frequency spectral analyzer. Beating was performed at two operating conditions, first near the QCL laser threshold (beating with the C18O2 R10 line) and then at a high injection current (beating with the C18O2 R8 line). Overall, beat note widths of 1.3–6.5 MHz were observed, which proves that a free-running QCL can have a short-term spectral width near 1 MHz.

© 2003 Optical Society of America

OCIS Codes
(120.4820) Instrumentation, measurement, and metrology : Optical systems
(120.5050) Instrumentation, measurement, and metrology : Phase measurement
(140.3070) Lasers and laser optics : Infrared and far-infrared lasers
(140.3490) Lasers and laser optics : Lasers, distributed-feedback
(140.3600) Lasers and laser optics : Lasers, tunable
(140.5960) Lasers and laser optics : Semiconductor lasers

Citation
D. Weidmann, L. Joly, V. Parpillon, D. Courtois, Y. Bonetti, T. Aellen, M. Beck, J. Faist, and D. Hofstetter, "Free-running 9.1-μm distributed-feedback quantum cascade laser linewidth measurement by heterodyning with a C 18O2 laser," Opt. Lett. 28, 704-706 (2003)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-28-9-704

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