Efficient and High Power InGaN Based MQW Blue Laser

Abstract

Abstract

This research work deals with the design of a 450 nm MQW blue laser to get the optimized output power and efficiency. The maximum output power is found for an injection current of 120 mA. This laser is designed to improve the performance of a MQW blue laser to get an efficient and high power output. For this purpose the structure is designed using In_0.235Ga_0.765N/Al_0.07Ga_0.93. A high performance of the laser is obtained with the optimized values of injection current and differential gain. A maximum optical output power of 223.8 mW is obtained which enhances the designed laser for the application in data storage, optical discs and displays, printings, laser-induced fluorescence spectroscopy, photobiology and medical diagnostics etc. The laser structure with shorter cavity length has the higher optical loss which increases the optical output power and efficiency. The performance characteristics and their dependence to cavity length of the blue laser have been investigated using MATLAB simulation. It is found that lasers having shorter cavity length give better performance.

Keywords: Blue laser, cavity length, output power, differential quantum efficiency, total external quantum efficiency