采用高电流注入条件下的载流子扩散方程和复折射率波导模型情况下的亥姆霍兹方程, 对980 nm高功率激光二极管外延材料的非对称和对称波导结构的光吸收损耗进行了理论计算。采用低压金属有机化学气相外延技术制备了两种波导结构的外延材料, 并制作了激光器件, 进行了光电特性测试和对比分析。理论计算和实验结果表明：与对称波导结构相比, 非对称波导结构外延材料并未减小光吸收损耗, 而是减小了串联电阻, 因而降低了器件的焦耳热损耗, 从而提高器件的电光效率。

为了实现激光二极管阵列(LDA)的高亮度光纤耦合输出, 设计了一套简单有效的光束整形系统。首先采用快慢轴准直透镜压缩LDA的发散角, 然后采用双平行平面反射镜光束整形装置, 将压缩后的LDA慢轴方向的光束分为4束(也可以根据需要分为任意多束), 并将4束子光束在快轴方向重新排列, 最后通过聚焦系统, 将整形后的光束耦合进入芯径600 μm, 数值孔径0.37的光纤。实验测得双平行平面反射镜整形装置的效率为98.87％, 系统的整体效率为 77.2％。该整形系统设计简单, 效率高, 具有很高的应用价值。

设计并制备了980 nm高量子效率和极低光损耗的激光二极管(LD)外延材料和器件。微通道封装1 cm激光二极管阵列在连续(CW)工作条件下最大电光效率达到60.0%,相应的斜率效率和输出光功率分别为1.1 W/A和38.2 W。测试得到外延材料的内损耗系数和内量子效率分别为0.58 cm-1和91.6%。测试分析表明,器件电光效率的提高主要在于新型的InGaAs/GaAsP应变补偿量子阱和大光腔结构设计。

A fiber coupled module is fabricated with integrating the emitting light from four laser diode bars into multimode fiber bundle. The continuous wave (CW) output power of the module is about 130 W with a coupling efficiency of around 80%. The output power is very stable after the temperature cycling and vibration test. No apparent power decrease has been observed as the device working continuously for 500 h.

A cladding-pumped ytterbium-doped fiber laser is described in this letter. Using unusual pumping source with 915-nm wavelength, slope efficiency up to 75% with respect to absorbed input power and output power is obtained, a maximum output power of 4.006 W with fundamental mode is measured.

In a practical coupling system, a cylindrical microlens is used to collimate the emission of a high power laser diode (LD) in the dimension perpendicular to the junction plane. Using passive alignment, the LD is placed in the focus of the cylindrical microlens generally, regardless of the performance of the multimode optical fiber and the LD. In this paper, a more complete analysis is arrived at by ray-tracing technique, by which the angle θ of the ray after refraction is computed as a function of the angle θ0 of the ray before refraction. The focus of the cylindrical microlens is not always the optimal position of the LD. In fact, in order to achieve a higher coupling efficiency, the optimal distance from the LD to the cylindrical microlens is dependent on not only the radius R and the index of refraction n of the cylindrical microlens, but also the divergence angle of the LD in the dimension perpendicular to the junction plane and the numerical aperture (NA) of the multimode optical fiber. The results of this discussion are in good agreement with experimental results.