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105 μm、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.