Dynamic filamentation and beam quality of quantum-dot lasers

被引：28

作者：

Gehrig, E ^{[1
]}

Hess, O

Ribbat, C

Sellin, RL

Bimberg, D

机构：

[1] Univ Surrey, Sch Elect & Phys Sci, Adv Technol Inst, Surrey GU2 7XH, England

[2] Tech Univ Berlin, Inst Festkorperphys, D-10623 Berlin, Germany

来源：

APPLIED PHYSICS LETTERS | 2004年 / 84卷 / 10期

关键词：

D O I：

10.1063/1.1668330

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We present a comparative study of numerical simulations and experiments on the spatiotemporal dynamics and emission characteristics of quantum-well and quantum-dot lasers of identical structure. They show that, in the quantum-dot laser, the strong localization of carrier inversion and the small amplitude-phase coupling enable a significant improvement of beam quality compared to quantum-well lasers of identical geometry. Near-field profiles and beam quality (M-2) parameters calculated on the basis of time-dependent effective Maxwell-Bloch equations into which the physical properties of the active media are included via space-dependent material parameters, effective time constants, and matrix elements are fully confirmed by experimental measurements. Together they indicate that, in the quantum-dot laser, the strong localization of carrier inversion and the small amplitude-phase coupling enable a significant improvement of beam quality compared with quantum-well lasers of identical geometry. (C) 2004 American Institute of Physics.

引用

页码：1650 / 1652

页数：3

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