Optical gain of a triple coaxial cylindrical quantum well wires laser under the geometrical effects and magnetic fields

In this study, impacts of external magnetic fields and middle layer's size on the optical gain of a coaxial cylindrical quantum well wire laser GaAs/AlxGa1−xAs/AlAs are investigated. By using numerical method, Schrodinger equation are solved and then its optical gain is calculated. Results show that, increasing the middle layer's height leads to blue-shift of the optical gain, and if the middle layer has enough breadth, there is a downfall in it. Otherwise, it remains the same roughly. Also, the max of optical gain and its resonance energy depends considerably on the geometrical size. Additionally, there is a redshift in the optical gain with broadening the layer. Moreover, there are a blue-shift and increase in the optical gain peak by enhancing the magnetic field.