宽面发射半导体激光器的光谱合束技术对发展高功率直接半导体激光光源具有重要意义。光栅外腔光谱合束基于光栅的波长选择特性和外腔半导体激光技术,实现单个合束单元的光谱锁定和所有合束单元的合束输出,输出光束质量与单个合束单元相当,亮度和功率得到很大提高。基于两个半导体激光器短阵列叠阵,进行了无输出耦合镜光栅外腔光谱合束实验研究,实现了12个半导体激光器短阵列的光谱合束。分析了光谱合束的输出光谱、输出功率和光束质量,在70 A的抽运电流下,连续输出功率为578 W,光谱带宽为10.26 nm,电光转换效率46.5%。

Spectral beam combining of a broad area diode laser is a promising technique for high power direct diode laser applications. Grating external cavity spectral beam combination is based on wavelength selection characteristics of the grating and external cavity diode laser technology to achieve the locking of the single emitter spectrum and the combination of all the sub-beam combining elements into one output. The beam quality of the output is equivalent to that of a single beam combining element, and the brightness and power are greatly improved. An experimental study on the coupler free grating external cavity spectral beam combining of two mini-bar stacks was presented. Spectral beam combination of 12 diode laser short array stripes was realized. The characteristics of spectrum, power, and beam quality of the output beam were analyzed. At the pump current of 70 A, the continuous output power of 578 W, spectral bandwidth of 10.26 nm, and electro-optical conversion efficiency of 46.5% were achieved.