Temperature sensitivity of threshold current density of a quantum dot laser

Levon V. Asryan; Robert A. Suris

doi:10.1117/12.316735

7 July 1998 Temperature sensitivity of threshold current density of a quantum dot laser

Levon V. Asryan, Robert A. Suris

Proceedings Volume 3283, Physics and Simulation of Optoelectronic Devices VI; (1998) https://doi.org/10.1117/12.316735
Event: Optoelectronics and High-Power Lasers and Applications, 1998, San Jose, CA, United States

Abstract

Detailed theoretical analysis of the temperature dependence of threshold current density of a semiconductor quantum dot (QD) laser, j_th, is given. Temperature dependences of the components of j_th associated with the radiative recombination in QDs and in the optical confinement layer (OCL) are calculated. Violation of the charge neutrality in QDs is shown to give rise to the slight temperature dependence of the current density component associated with the recombination in QDs. The temperature is calculated (as a function of the parameters of the structure) at which the components of j_th become equal to each other. Temperature dependences of the optimum surface density of QDs and the optimum thickness of the OCL, minimizing j_th, are obtained. The characteristic temperature of QD laser, T₀, is calculated considering carrier recombination in the OCL (barrier regions) and violation of the charge neutrality in QDs. The inclusion of violation of the charge neutrality is shown to be critical for the correct calculation of T₀. The characteristic temperature is shown to fall off profoundly with increasing temperature. A drastic decrease in T₀ is shown to occur in passing from temperature conditions wherein j_th is controlled by radiative recombination in QDs to temperature conditions wherein j_th is controlled by radiative recombination in the OCL. The dependences of T₀ on the root mean square of relative QD size fluctuations, total losses and surface density of QDs are obtained.

Citation Download Citation

Levon V. Asryan and Robert A. Suris "Temperature sensitivity of threshold current density of a quantum dot laser", Proc. SPIE 3283, Physics and Simulation of Optoelectronic Devices VI, (7 July 1998); https://doi.org/10.1117/12.316735

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