Direct measurement of linewidth enhancement factors in quantum well lasers of different quantum well barrier heights

5 April 1993

journal article
research article
Published by AIP Publishing in Applied Physics Letters

Vol. 62 (14) , 1591-1593
https://doi.org/10.1063/1.108647

Abstract

The wavelength dependence of the linewidth enhancement factor (amplitude-phase coupling factor) α in quantum well lasers of different quantum well barrier heights have been determined from the spontaneous emission spectra and the Fabry–Perot mode wavelength shifts. It is found that the α parameter at lasing wavelength in GaAs/Al0.15Ga0.85As lasers is about twice as large as that in GaAs/Al0.30Ga0.70As lasers. The observation is consistent with the previously observed spectral linewidth behavior in these lasers, which were attributed to the different state filling effects.

Keywords

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