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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 18, Iss. 13 — Jun. 21, 2010
  • pp: 13616–13630

Dynamics of actively mode-locked Quantum Cascade Lasers

V.-M. Gkortsas, C. Wang, L. Kuznetsova, L. Diehl, A. Gordon, C. Jirauschek, M. A. Belkin, A. Belyanin, F. Capasso, and F. X. Kärtner  »View Author Affiliations


Optics Express, Vol. 18, Issue 13, pp. 13616-13630 (2010)
http://dx.doi.org/10.1364/OE.18.013616


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Abstract

The impact of upper state lifetime and spatial hole burning on pulse shape and stability in actively mode locked QCLs is investigated by numerical simulations. It is shown that an extended upper state lifetime is necessary to achieve stable isolated pulse formation per roundtrip. Spatial hole burning helps to reduce the pulse duration by supporting broadband multimode lasing, but introduces pulse instabilities which eventually lead to strongly structured pulse shapes that further degrade with increased pumping. At high pumping levels gain saturation and recovery between pulses leads to suppression of mode locking. In the absence of spatial hole burning the laser approaches single-mode lasing, while in the presence of spatial hole burning the mode locking becomes unstable and the laser dynamics does not reach a steady state anymore.

© 2010 OSA

OCIS Codes
(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: February 23, 2010
Revised Manuscript: April 27, 2010
Manuscript Accepted: June 7, 2010
Published: June 10, 2010

Citation
V.-M. Gkortsas, C. Wang, L. Kuznetsova, L. Diehl, A. Gordon, C. Jirauschek, M. A. Belkin, A. Belyanin, F. Capasso, and F. X. Kärtner, "Dynamics of actively mode-locked Quantum Cascade Lasers," Opt. Express 18, 13616-13630 (2010)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-18-13-13616


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