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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 15 — Jul. 16, 2012
  • pp: 17145–17159

Effects of resonant tunneling and dynamics of coherent interaction on intrinsic linewidth of quantum cascade lasers

Tao Liu, Kenneth E. Lee, and Qi Jie Wang  »View Author Affiliations


Optics Express, Vol. 20, Issue 15, pp. 17145-17159 (2012)
http://dx.doi.org/10.1364/OE.20.017145


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Abstract

A theoretical model for calculation of the intrinsic linewidth of QCLs is built on the basis of the quantum Langevin approach. It differs from the traditional rate equation model in that the resonant tunneling and the dynamics of coherent interaction can be considered. Results show that the coupling strength and the dephasing rate associated with resonant tunneling strongly affect the linewidth of THz QCLs in the incoherent resonant-tunneling transport regime but only induce little influence in the coherent regime. The dynamics of coherent interaction and resonant-tunneling transport show insignificant effects on the linewidth calculation of mid-infrared QCLs due to strong coupling in resonant tunneling. We also demonstrate that by properly designing the active regions of QCLs, one can reduce the intrinsic linewidth according to our model.

© 2012 OSA

OCIS Codes
(140.3070) Lasers and laser optics : Infrared and far-infrared lasers
(270.2500) Quantum optics : Fluctuations, relaxations, and noise
(300.3700) Spectroscopy : Linewidth
(140.5965) Lasers and laser optics : Semiconductor lasers, quantum cascade

ToC Category:
Lasers and Laser Optics

History
Original Manuscript: May 23, 2012
Revised Manuscript: June 30, 2012
Manuscript Accepted: July 9, 2012
Published: July 12, 2012

Citation
Tao Liu, Kenneth E. Lee, and Qi Jie Wang, "Effects of resonant tunneling and dynamics of coherent interaction on intrinsic linewidth of quantum cascade lasers," Opt. Express 20, 17145-17159 (2012)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-20-15-17145


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