Browsing by Author "Kou, RJ"

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Formation of transverse modes with Y-junction structures in broad-area oxide-confined vertical-cavity surface-emitting laser
(2003-07-15)
Kou, RJ
;
Pan, CL
;
光電工程學系
;
Department of Photonics
We performed experimental and theoretical investigations on the transverse-mode emission behavior of a broad-area oxide-confined vertical-cavity surface-emitting laser (VCSEL). The far-field emission pattern with y-junction structures is observed in the VCSEL with a 20-mum-diameter aperture when the injection current is significantly above the thermal roll-over point. In order to provide a quantitative understanding of these emission characteristics, we present a numerical simulation to model and fit the experimental results. The numerical simulation adopts the high-order Laguerre-Gaussian mode due to the assumptions of a parabolic refractive-index profile and ring-shaped carrier distribution in the laser. From the numerical simulation results, the formation of y-junction structures is inferred to be caused by the superposition of two high-order Laguerre-Gaussian modes. The results of this numerical simulation are in good agreement with the experimental findings.
Transverse mode with Y-junction structures in broad-area oxide-confined vertical-cavity surface-emitting laser
(2003-05-01)
Kou, RJ
;
Pan, CL
;
光電工程學系
;
Department of Photonics
We present experimental data characterizing the first-observed transverse mode with y-junction structures in a broad-area (20 mum in diameter) oxide-confined vertical-cavity surface-emitting laser at a 22.3 mA injection current which is larger than the thermal roll-over point. The formation of the y-junction structured pattern, which can be observed in far-field images, is due to an interaction between adjacent high-order transverse modes.