Theory and simulation of self- and mutual-diffusion of carrier density and temperature in semiconductor lasers

J. Li, S. H. Cheung, Cun-Zheng Ning

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Scopus citations


Carrier diffusion and thermal conduction play a fundamental role in the operation of high-power, broad-area semiconductor lasers. Restricted geometry, high pumping level and dynamic instability lead to inhomogeneous spatial distribution of plasma density, temperature, as well as light field, due to strong light-matter interaction. Thus, modelling and simulation of such optoelectronic devices rely on detailed descriptions of carrier dynamics and energy transport in the system. A self-consistent description of lasing and heating in large-aperture, spatially-inhomogeneous edge- or surface- emitting lasers (VCSELs) require coupled diffusion equations for carrier density and temperature. In this paper, we derive such equations from the Boltzmann transport equation for the carrier distributions. The derived self- and mutual-diffusion coefficients are in general nonlinear functions of carrier density and temperature including many-body interactions. We study the effects of many-body interactions on these coefficients, as well as the nonlinearity of these coefficients for large-area VCSELs. The effects of mutual diffusions on carrier and temperature distributions in gain-guided VCSELs will be also presented.

Original languageEnglish (US)
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
EditorsY. Arakawa, P. Blood, M. Osinski
Number of pages8
StatePublished - 2001
Externally publishedYes
EventPhysics and Simulation of Optoelectronic Devices IX - San Jose, CA, United States
Duration: Jan 22 2001Jan 26 2001


OtherPhysics and Simulation of Optoelectronic Devices IX
Country/TerritoryUnited States
CitySan Jose, CA


  • Carrier diffusion
  • Inhomogeneity
  • Plasma heating effect
  • Semiconductor laser

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Condensed Matter Physics


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