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Article
Thermal Management of Vertical External Cavity Surface Emitting Laser Grown on GaAs Substrate

Author: G. Balluo
Journal: Iraqi Journal of Applied Physics المجلة العراقية للفيزياء التطبيقية ISSN: 18132065 23091673 Year: 2017 Volume: 13 Issue: 2 Pages: 15-18
Publisher: iraqi society for alternative and renewable energy sources and techniques الجمعية العراقية لمصادر وتقنيات الطاقة البديلة والمستجدة

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Abstract

In a VECSELs, it seems that most of the heat comes from the pumping mechanism which is the external laser that is exciting the active medium. The pump photons have higher energy than the emitted photons and thus the energy difference is dissipated as heat in the active medium. As the temperature increases in the active medium the excited carriers star escaping the quantum wells until the laser gain is depleted and the power output decreases. Thermal management is crucial for VECSEL power performance and it is usually addressed by using heat spreader plates and heat sinks as will be explained next.


Article
Using Substrate Removal Technique for GaAs-Based VECSEL Optimization

Author: C.L. Yang
Journal: Iraqi Journal of Applied Physics المجلة العراقية للفيزياء التطبيقية ISSN: 18132065 23091673 Year: 2017 Volume: 13 Issue: 2 Pages: 23-26
Publisher: iraqi society for alternative and renewable energy sources and techniques الجمعية العراقية لمصادر وتقنيات الطاقة البديلة والمستجدة

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Abstract

A combination of two types of etching mechanisms: physical etching which relies on physical interaction of particles that erode the surface, and wet/dry etching that relies on chemical reactions to erode the surface, is used to remove substrates with thickness between 300 and 500µm. First, the substrate is mechanically thin down to about 100µm and then wet etching or dry etching is applied. The substrate removal of GaAs was successfully achieved as verified in the x-ray diffraction etch analysis.

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