双光栅实现半导体激光阵列波长组束

Spectral beam combining for a diode laser array by using agrating pair

在波长光束组合基础上,用一个光栅和一个准直透镜代替传输透镜,可以有效地减小单个发光单元光束质量的退化,明显地克服相邻发光单元的反馈串扰,实现了较窄线宽的光谱组束输出。采用标准的半导体激光阵列,连续输出激光功率44.8 W,电光转换效率最高38.9%,光谱线宽为4.1nm。光束慢轴方向光束质量因子为11.7,快轴方向光束质量因子为1.37,快慢轴两个方向都接近单个发光单元光束质量。

A grating and a collimating lens are used to replace the transformer lens in the traditional spectral beam combining structure.As a result,the degradation of the beam quality and the cross-talk are prevented.A spectral beam combining with narrow line-width is achieved.A standard semiconductor laser array is employed in this experiment.An output power of 44.8Wand an electro-optic conversion efficiency of 38.9% are achieved.The spectral line-width is 4.1nm.A beam quality factor of 1.37×11.7in fast and slow axis directions are obtained.The beam quality of the output is close to that of a single emitter of the array in both directions.