基于光参数积的单管半导体激光器光束质量描述与评价  

Description and Evaluation of Beam Quality of Single Emitter Diode Laser Based on Beam Parameter Product

作　　者：牛奔[1] 王宝华[1] 郭渭荣[1] 曲研[1] 王丽荣[1] 赵亚平[1] 刘燕楠[1] 林学春[1] 

机构地区：[1]中国科学院半导体研究所,北京100083

出　　处：《中国激光》2015年第2期22-28,共7页Chinese Journal of Lasers

摘　　要：根据单管半导体激光器出射光束特点,分别采用1/e2、环围能量以及二阶矩定义描述光束束宽,在高斯光束近似下采用双曲线拟合法测算得到不同方法定义束宽时的光参数积(BPP),并与芯径为105μm、数值孔径为0.2的光纤所能接受的最大BPP进行比较。对该单管半导体激光器进行光纤耦合,实验中单管半导体激光边模数量随注入电流的增大逐渐增多,光束质量的恶化导致其光纤耦合效率逐渐降低,当注入电流由1 A增大到13 A时,光纤耦合效率由96.5%降为88.8%。研究表明以二阶矩定义束宽半径测算光参数积BPP去描述与评价单管半导体激光器光束质量特征是最为准确合理的。Considering characteristics of beam output from output single emitter diode laser, beam width is described using 1/e2 maximum, power in bucket and second moment. The beam parameter product （BPP） in various definitions based on the hyperbolic fitting method with approximation of Gaussian beam can be obtained. The calculated BPPs of the beam from a single emitter diode laser are compared with the BPP of fiber with core diameter of 105 μm and numerical aperture of 0.2. The side mode increases gradually with increasing injection current, leading to deterioration of the beam quality, and reduces the coupling efficiency. As the injection current increases from 1 A to 13 A, the coupling efficiency decreases from 96.5% to 88.8%. Therefore, the beam width defined by the second moment is an accurate method for the description and evaluation the beam quality of single emitter diode laser based on BPP.

关 键 词：激光器 半导体激光器 单管 光纤耦合 光束质量 光参数积 二阶矩 

分 类 号：TN248.4[电子电信—物理电子学]