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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 14 — Jul. 2, 2012
  • pp: 14754–14768

Investigation of the effects of nonlinear optical gain and thermal carrier excitation on characteristics of self-assembled quantum-dot lasers

Davoud Ghodsi Nahri  »View Author Affiliations


Optics Express, Vol. 20, Issue 14, pp. 14754-14768 (2012)
http://dx.doi.org/10.1364/OE.20.014754


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Abstract

Comparing simulation results with experimental findings, it is found that considering nonlinear optical gain is quite essential to accurately obtain dynamic and static characteristics of self-assembled quantum-dot lasers (SAQDLs). In fact, the nonlinear optical gain prevents extreme decline or growth of photon population as the time increases and of output power as the injected current enhances. It also results in multi-mode lasing and increasing the number of lasing modes with elevation of the injected current. In addition, the best performance of SAQDLs, at a certain injected current, depends on homogeneous and inhomogeneous broadening. Thermal carrier excitation results in degradation of light-current characteristics. It also leads to a red shift in dominant lasing modes at low injected currents, the dominant lasing modes move toward higher energies as the current enhances until the most dominant mode becomes the central one.

© 2012 OSA

OCIS Codes
(140.0140) Lasers and laser optics : Lasers and laser optics
(140.5960) Lasers and laser optics : Semiconductor lasers

ToC Category:
Lasers and Laser Optics

History
Original Manuscript: August 4, 2011
Revised Manuscript: November 2, 2011
Manuscript Accepted: December 15, 2011
Published: June 18, 2012

Citation
Davoud Ghodsi Nahri, "Investigation of the effects of nonlinear optical gain and thermal carrier excitation on characteristics of self-assembled quantum-dot lasers," Opt. Express 20, 14754-14768 (2012)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-20-14-14754


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