Dynamic filamentation and beam quality of quantum-dot lasers | Zendy

Edeltraud Gehrig | Zendy; Ortwin Hess | Zendy; C. Ribbat | Zendy; R.L. Sellin | Zendy; D. Bimberg | Zendy

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Dynamic filamentation and beam quality of quantum-dot lasers

Author(s) -

Edeltraud Gehrig,

Ortwin Hess,

C. Ribbat,

R.L. Sellin,

D. Bimberg

Publication year - 2004

Publication title -

applied physics letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.182

H-Index - 442

eISSN - 1077-3118

pISSN - 0003-6951

DOI - 10.1063/1.1668330

Subject(s) - laser beam quality , laser , filamentation , quantum dot laser , physics , quantum dot , quantum , amplitude , quantum well , semiconductor laser theory , optics , computational physics , optoelectronics , quantum mechanics , laser beams

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.

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