研究目的
Investigating the characteristics of a GaAs-based laser with InGaAs waveguide quantum wells operating at room temperature in the electric-pumping mode.
研究成果
The experimental investigations of GaAs heterolasers with InGaAs waveguide quantum wells generating at room temperature in the electric-pumping mode showed a substantially lowered threshold current as well as a decreased laser-beam divergence in the plane perpendicular to the structure layers. The distinguishing feature of these laser diodes is a substantially lowered threshold current as well as a decreased laser-beam divergence in the plane perpendicular to the structure layers.
研究不足
The development of such lasers is accompanied by difficulties, the most important of which is the threshold current due to a small optical-confinement factor and rather large waveguide losses. Serious requirements are imposed on the growth conditions and parameters of such heterostructures.
1：Experimental Design and Method Selection:
The study involved the fabrication and testing of GaAs-based lasers with InGaAs waveguide quantum wells. The methodology included the growth of the laser structure by MOS-hydride epitaxy, fabrication of laser diodes, and measurement of their spectral and spatial emission characteristics.
2：Sample Selection and Data Sources:
The laser structure was grown on an n-type GaAs substrate. The study fabricated three types of lasers with cavity lengths of 1, 2, and 3 mm.
3：List of Experimental Equipment and Materials:
Equipment used included a horizontal quartz reactor for epitaxy, an MDR-23 monochromator for spectral measurements, and thermal evaporation in vacuum for depositing metallic ohmic contacts.
4：Experimental Procedures and Operational Workflow:
The procedure involved the growth of the laser structure, fabrication of laser diodes, and measurement of their emission characteristics at room temperature in the pulsed pumping mode.
5：Data Analysis Methods:
The electric field distribution in the TE mode was calculated by the method of distribution matrices. The spectral and spatial dependences of the emission were analyzed to determine the laser's performance characteristics.
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