Effects of the linewidth enhancement factor on filamentation in 1.55 μm broad-area laser diodes

Du Chang Heo; Il Ki Han; Jung Il Lee; Ji Chai Jeong; Si Hyung Cho

doi:10.1088/0268-1242/18/6/316

Effects of the linewidth enhancement factor on filamentation in 1.55 μm broad-area laser diodes

Du Chang Heo, Il Ki Han, Jung Il Lee, Ji Chai Jeong, Si Hyung Cho

Department of Brain and Cognitive Engineering

Research output: Contribution to journal › Article › peer-review

6 Citations (Scopus)

Abstract

Broad-area laser diodes with different linewidth enhancement factors (α-factors ) of 2 and 4 have been fabricated on 1.55 μm multi-quantum well structures. Far-field measurements show that the filamentation of the laser diodes is closely related to the α-factor. The full width at half maximum (FWHM) of the far-fields and the filamentation were reduced in the laser diodes with smaller α-factors. As the injection current increased, the FWHM of the far-fields also increased regardless of the value of the α-factor. This phenomenon is explained by the reduction of the filament spacing as the injection current increased. A qualitative explanation of filamentation mechanisms is given by introducing the notion of sub-aperture.

Original language	English
Pages (from-to)	486-490
Number of pages	5
Journal	Semiconductor Science and Technology
Volume	18
Issue number	6
DOIs	https://doi.org/10.1088/0268-1242/18/6/316
Publication status	Published - 2003 Jun

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Electrical and Electronic Engineering
Materials Chemistry

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title = "Effects of the linewidth enhancement factor on filamentation in 1.55 μm broad-area laser diodes",

abstract = "Broad-area laser diodes with different linewidth enhancement factors (α-factors ) of 2 and 4 have been fabricated on 1.55 μm multi-quantum well structures. Far-field measurements show that the filamentation of the laser diodes is closely related to the α-factor. The full width at half maximum (FWHM) of the far-fields and the filamentation were reduced in the laser diodes with smaller α-factors. As the injection current increased, the FWHM of the far-fields also increased regardless of the value of the α-factor. This phenomenon is explained by the reduction of the filament spacing as the injection current increased. A qualitative explanation of filamentation mechanisms is given by introducing the notion of sub-aperture.",

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T1 - Effects of the linewidth enhancement factor on filamentation in 1.55 μm broad-area laser diodes

AU - Heo, Du Chang

AU - Han, Il Ki

AU - Lee, Jung Il

AU - Jeong, Ji Chai

AU - Cho, Si Hyung

PY - 2003/6

Y1 - 2003/6

N2 - Broad-area laser diodes with different linewidth enhancement factors (α-factors ) of 2 and 4 have been fabricated on 1.55 μm multi-quantum well structures. Far-field measurements show that the filamentation of the laser diodes is closely related to the α-factor. The full width at half maximum (FWHM) of the far-fields and the filamentation were reduced in the laser diodes with smaller α-factors. As the injection current increased, the FWHM of the far-fields also increased regardless of the value of the α-factor. This phenomenon is explained by the reduction of the filament spacing as the injection current increased. A qualitative explanation of filamentation mechanisms is given by introducing the notion of sub-aperture.

AB - Broad-area laser diodes with different linewidth enhancement factors (α-factors ) of 2 and 4 have been fabricated on 1.55 μm multi-quantum well structures. Far-field measurements show that the filamentation of the laser diodes is closely related to the α-factor. The full width at half maximum (FWHM) of the far-fields and the filamentation were reduced in the laser diodes with smaller α-factors. As the injection current increased, the FWHM of the far-fields also increased regardless of the value of the α-factor. This phenomenon is explained by the reduction of the filament spacing as the injection current increased. A qualitative explanation of filamentation mechanisms is given by introducing the notion of sub-aperture.

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Effects of the linewidth enhancement factor on filamentation in 1.55 μm broad-area laser diodes

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