数值模拟980nm锥形半导体激光器输出特性

具有高功率及高亮度激光特性的锥形半导体激光器在激光加工、自由空间通信、医疗等领域具有广泛的应用前景.本文基于广角差分光束传播法(WA-FD-BPM),对980 nm锥形半导体激光器进行了仿真模拟,详细分析了不同结构参数(脊形区刻蚀深度、锥形角度、不同脊形区/锥形区长度比、锥形区刻蚀深度、前腔面反射率)对器件光束质量和P...

Numerical Simulation on Output Characteristics of 980 nm Tapered Semiconductor Lasers

Tapered semiconductor lasers with high power and high brightness characteristics have been extensively used in many fields such as laser processing,free space communications,and medical etc.A simulation on 980 nm tapered semiconductor lasers has been done based on the wide-angle differential beam propagation method(WA-FD-BPM)in this work.The effects of structural parameters(such as ridge etching depth,taper angle,different ridge/taper length ratio,taper etching depth,front cavity reflectance)on the beam quality and P-I-V characteristics of the device are analyzed in detail.The analysis shows that the geometric loss of the tapered waveguide is the main factor leading to the decrease of the slope efficiency of the device,and the optical pumping effect is an important factor affecting the deterioration of the beam quality.The beam quality can be improved by reducing the reflectivity of the front cavity surface of the device.The results in this paper can provide a certain theoretical reference for the design and analysis of tapered lasers.