将一个808 nm宽发射区半导体激光器应用于纵模选择束腰劈裂偏振合束外腔中，实现了高光束质量、高亮度和窄线宽的激光输出。所获激光输出功率为5.08 W，快慢轴光束质量M²=1.85×18.2，慢轴光束质量较自由运转激光器提高48%，输出激光亮度B=22.74 MW·cm^-2·sr^-1，是原激光器自由运转的1.3倍。所获激光光谱线宽为0.47 nm，压缩至原激光器自由运转的光谱宽度的0.14。

通过小角度V形腔外腔光谱合束将两个808 nm半导体激光器合束，提高半导体激光器的输出功率及光束质量。两个合束单元分别工作在795.8 nm和800.5 nm，将所获光束通过非线性光学方法进行频率转换。外腔光谱合束实现输出功率为6.5 W快慢轴光束质量M²=2.2×18.5的光束输出，所获光束慢轴M²因子相较于自由运转单管激光器提高了30%，外腔光谱合束效率为83%。基于所获光源，实现了半导体激光器小角度V形腔外腔光谱合束和频，获得输出功率为18.3 mW波长为401.0 nm的蓝光输出，和频效率为0.28%。

We report a wavelength-tunable multi-point pump scheme of the semiconductor disk lasers (SDLs). By designing an external cavity of SDL with an intra-cavity transmission grating, multiple pump gain regions share the same resonator. The effect of the intra-cavity grating on the output laser power, wavelength, and beam quality was investigated. The emission wavelength could be tuned over a bandwidth of ∼18nm. With multi-point pumping, we achieve the laser output power with almost no loss, and further improvement is limited by the thermal effect. The changes in the beam are due to the mode selectivity by the intra-cavity grating.

A modified spectral beam combining (SBC) approach based on double asymmetrical filters was proposed. By using this scheme, the high-order lateral modes at the edge of the far-field pattern can be suppressed in the external cavity, and the beam quality in the slow-axis direction was improved from 16.1 to 13.4 compared to the conventional SBC. In the meanwhile, the electrical-to-optical efficiency from the modified SBC was more than 40% with an output power of 34.1 W, which is similar to that of the conventional SBC.