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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 17, Iss. 15 — Jul. 20, 2009
  • pp: 12929–12943

Mode-locked pulses from mid-infrared Quantum Cascade Lasers

Christine Y. Wang, Lyuba Kuznetsova, V. M. Gkortsas, L. Diehl, F. X. Kärtner, M. A. Belkin, A. Belyanin, X. Li, D. Ham, H Schneider, P. Grant, C. Y. Song, S. Haffouz, Z. R. Wasilewski, H. C. Liu, and Federico Capasso  »View Author Affiliations


Optics Express, Vol. 17, Issue 15, pp. 12929-12943 (2009)
http://dx.doi.org/10.1364/OE.17.012929


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Abstract

In this study, we report the unequivocal demonstration of midinfrared mode-locked pulses from quantum cascade lasers. The train of short pulses was generated by actively modulating the current and hence the gain of an edge-emitting quantum cascade laser (QCL). Pulses with duration of about 3 ps at full-width-at-half-maxima and energy of 0.5 pJ were characterized using a second-order interferometric autocorrelation technique based on a nonlinear quantum well infrared photodetector. The mode-locking dynamics in the QCLs was modeled based on the Maxwell-Bloch equations in an open two-level system. Our model reproduces the overall shape of the measured autocorrelation traces and predicts that the short pulses are accompanied by substantial wings as a result of strong spatial hole burning. The range of parameters where short mode-locked pulses can be formed is found.

© 2009 Optical Society of America

OCIS Codes
(140.3070) Lasers and laser optics : Infrared and far-infrared lasers
(140.4050) Lasers and laser optics : Mode-locked lasers
(140.5965) Lasers and laser optics : Semiconductor lasers, quantum cascade

ToC Category:
Lasers and Laser Optics

History
Original Manuscript: June 30, 2009
Revised Manuscript: July 7, 2009
Manuscript Accepted: July 7, 2009
Published: July 13, 2009

Citation
Christine Y. Wang, Lyuba Kuznetsova, V. M. Gkortsas, L. Diehl, F. X. Kärtner, M. A. Belkin, A. Belyanin, X. Li, D. Ham, H. Schneider, P. Grant, C. Y. Song, S. Haffouz, Z. R. Wasilewski, H.C. Liu, and Federico Capasso, "Mode-locked pulses from mid-infrared Quantum Cascade Lasers," Opt. Express 17, 12929-12943 (2009)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-17-15-12929


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