基于半导体激光器堆栈的光纤耦合技术

Fiber Coupling Technology Based on Diode Laser Stack

由于半导体激光器快慢轴方向的光束质量相差较大,为完成半导体激光器堆栈的光纤耦合,通常采用棱镜堆对光束进行整形。提出一种先填充快轴方向暗区、后旋转重排的光束整形技术,基于棱镜内部的全反射和平行平板对光束的偏移作用,在不使用棱镜堆的情况下完成了整个光束的整形过程。所提技术可将8个巴条组成的半导体激光器堆栈耦合到芯径为200μm、数值孔径为0.22的光纤中,输出功率可达544.47 W,系统的光-光转换效率达到85%。

Because of the large difference in beam quality between the fast axis and slow axis directions of the diode laser, a prism stack is used for beam shaping to complete fiber coupling of the diode laser stack. A beam shaping technology of filling the dark areas in the fast axis direction before rotating rearrangement is proposed. The technology is based on the total internal reflection of prism stack and the deviation effect of the parallel plate, and it can complete the whole beam shaping process without using prism stack. By the proposed technology, the laser from stack which is equipped with 8 bars is coupled into a fiber with a core diameter of 200 /Lm and numerical aperture of 0.22. The output power can reach 544.47 W and optical-to-optical conversion efficiency of the system can reach up to 85 %.