Coupling system for laser-diode-array end-pumped slab amplifiers
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摘要: 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80 kW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 mm85 mm的泵浦光，在输出口处压缩至18 mm18 mm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8.5 mm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。Abstract: A coupling system with a high contraction coefficient, up to 86∶1, has been designed and manufactured. The output from the spherically arranged 80 kW LD arrays is delivered by orthogonal cylindrical lenses and a hollow duct. Experimentally measured coupling efficiency of the system is 84.2%. Intensity modulation values of the pump-field at the exit are 1.30 of LD fast axis and 1.18 of LD slow axis. The pump light can transport a distance of 8.5 mm at least with its shape preserved. The coupling system can meet the requirements of end-pumped slab amplifiers for high pump power and pump power density.
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Key words:
- solid-state lasers /
- pump coupling /
- laser diode array /
- hollow duct
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