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为了满足片状激光放大器对泵浦功率密度的要求,设计并加工了高缩束比的耦合系统。根据LD的发光特性,将输出功率为80kW的LD阵列进行拟球面排列,采用正交柱面透镜配合空心导光管进行泵浦耦合,将发光面积为330 mm×85mm的泵浦光,在输出口处压缩至18mm×18mm的口径,耦合系统的缩束比高达86∶1。模拟计算表明,该耦合系统的耦合效率对导光管反射板的反射率依赖性较低。实验测量该耦合系统的效率为84.2%,输出口处泵浦光场快慢轴的调制度分别为1.30和1.18,且脱离耦合系统后的泵浦光传输8.5mm后,依然可以保持泵浦光场的轮廓。该耦合系统在效率、泵浦场均匀性、传输性等方面均满足端面泵浦的片状放大器对泵浦耦合系统的要求。
In order to meet the requirements of the chip laser amplifier for pump power density, a coupling system with high shrinkage ratio was designed and fabricated. According to the luminescent properties of LD, the LD array with an output of 80kW is arranged in a pseudo-spherical arrangement. The pump lens is coupled with a hollow cylindrical light guide using an orthogonal cylinder lens. The pump light with a light emitting area of 330 mm × 85 mm is output at the output Compressed to the mouth of 18mm × 18mm diameter, coupling system, the reduction ratio up to 86: 1. Simulation results show that the coupling efficiency of the coupled system has a low dependence on the reflectance of the reflector. The experimental results show that the efficiency of the coupled system is 84.2%. The modulations of the fast and slow axes of the pump light field at the output port are 1.30 and 1.18 respectively. After the pump light is separated from the coupled system by 8.5mm, the pump light field Outline. The coupling system meets the requirements of the pump-coupled system of end-pumped chip amplifiers in terms of efficiency, uniformity of pumping field and transmission.