Analyses of mode-hopping phenomena in an AlGaAs laser

Author

Ohtsu, Motoichi ; Teramachi, Yasuaki ; Otsuka, Yoshihiro ; Osaki, Akio

Author_Institution

Tokyo Inst. of Tech., Yokohama, Japan

Volume

22

Issue

4

fYear

1986

fDate

4/1/1986 12:00:00 AM

Firstpage

535

Lastpage

543

Abstract

Intensity fluctuations of the longitudinal modes of a 0.8 μm AlGaAs laser were precisely measured during the occurrence of hopping between two modes. It was found from this result that mode hopping follows the stochastics of a Poisson process. The frequency of mode hopping was measured as $f_{c} = [\\exp [-95(I/I_{th} - 1)]] \\times 10^{7}$ (Hz). where $I/I_{th}$ is the injection current normalized to its threshold value. Results of analog computer simulations showed that spontaneous emission worked as a triggering force for mode hopping. Results of the analysis based on the Fokker-Planck equation were compared to the experimental results, from which the root-mean-square value of the fluctuating electric field of spontaneous emission was estimated as $2.3 \\times 10^{2}$ (V/m) $\\leq\\langle \\sim{E}_{N} \\leq 3.2 \\times 10^{2}$ (V/m). It is concluded that an effective reduction of mode hopping is achieved if the laser is operated at a higher bias or if the coupling constant between the two modes is increased.

Keywords

Gallium materials/lasers; Laser modes; Analog computers; Computational modeling; Computer simulation; Current measurement; Equations; Fluctuations; Frequency measurement; Laser modes; Spontaneous emission; Stochastic processes;

fLanguage

English

Journal_Title

Quantum Electronics, IEEE Journal of

Publisher

ieee

ISSN

0018-9197

Type

jour

DOI

10.1109/JQE.1986.1072987

Filename

1072987