NDLI: Effects of bandgap, lifetime, and other nonuniformities on diode laser thresholds and slope efficiencies

Content Provider	IEEE Xplore Digital Library
Author	Vurgaftman, I. Meyer, J.R.
Copyright Year	1995
Abstract	We examine the effect of various types of spatial nonuniformities on the performance of semiconductor diode lasers. Light versus current (L-I) characteristics are modeled by solving the coupled rate equations for the carrier density, photon density, carrier temperature, and lattice temperature. In cases of macroscopic nonuniformities, that is, when the fluctuation correlation length (/spl Lambda//sub F/) is longer than the carrier diffusion length (L/sub D/), the cavity is divided into a large number of segments, and separate rate equations are solved for each segment. Type-II antimonide quantum wells are used as the model diode laser system. Macroscopic nonuniformities of the nonradiative lifetime are shown to have little effect on the slope efficiency at high injection levels, but produce a signature softening of the threshold abruptness if the nonuniformity is large enough. This results from the nonuniformity of the carrier concentration and consequent mixture of gain and loss regions. For the case of microscopic bandgap fluctuations (L/sub D//spl Gt//spl Lambda//sub F/), inhomogeneous broadening of the gain spectrum leads to an increase of the threshold current density, which is accompanied by only a small reduction of the efficiency. However, in the complementary limit of macroscopic bandgap fluctuations (L/sub D/
Sponsorship	IEEE Lasers and Electro-Optics Society
Starting Page	475
Ending Page	484
Page Count	10
File Size	205398
File Format	PDF
ISSN	1077260X
Volume Number	3
Issue Number	2
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1997-04-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Photonic band gap Fluctuations Threshold current Semiconductor diodes Equations Temperature Laser modes Semiconductor lasers Optical coupling Charge carrier density
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics Electrical and Electronic Engineering

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