通过分析高功率线阵半导体激光器(DL)的激光输出特性,设计了-套光束变换装置,可将10 mm宽的线阵DL激光耦合进单根光纤中.变换过程如下:首先用微柱透镜对DL的快轴方向准直,然后利用微台阶反射镜,通过提高慢轴方向光束质量而降低快轴方向光束质量的方法,使得线阵DL两个方向的光束质量相近,从而可以汇聚成-接近圆形的光斑,再用聚焦透镜耦合进单根光纤中.在实验中实现了将输出功率为42 W的连续线阵DL的输出激光耦合进-根芯径为1 mm,数值孔径NA=0.38的光纤中,光纤输出激光功率为连续25 W,整个光束变换系统的耦合效率为59.5%.

The optic characters of high power laser diode linear arrays are analyzed, and a device is designed to reshape its laser beam, the emission of a 10 mm width continued wave laser diode linear arrays can be coupled into a fiber by the device. The laser beam of laser diode is collimated in fast direction by a cylindrical micro lens, then a pair of step-mirrors symmetries the beam parameter products in fast direction and slow direction, and a focusing lens couples the light into an optical fiber. Experiment is carried out, the emission of a laser diode linear array with 42 W laser power was coupled into a fiber witii the core diameter of lmm and numerical aperture of 0.38. The output power of 25 W from the fiber is obtained with the coupling efficiency of 59.5%.