作　　者： ; ; ; ; ; ;

机构地区： 北京工业大学

出　　处： 《光电子．激光》 2013年第10期1917-1921,共5页

摘　　要： 报道了采用一种紧凑型、低成本和角度复用的板条多通放大器,并对窄脉宽高重复频率种子激光进行多通放大的实验研究。通过使用角度复用多通结构,可以有效使用增益介质,光在介质内不走重复路径,相对于走重复路径的偏振复用结构,可减少进入主振荡器的反馈,抑制寄生振荡。实验过程中,分别采用直通和内全反射两种入射方式对种子光进行放大。注入脉宽为2.5ns、重复频率20kHz、平均功率为0.5W的Nd:YAG/Cr4+:YAG被动调Q种子光,采用内全反射方式进行三通放大时,得到了3.2W的最大平均功率输出,表明内全反射方式比直通型方式能更有效地实现光放大、减小热畸变、改善光束质量和提高输出功率。 A compact, lower cost, angular multiplexing multi-pass slab amplifier is reported. The tradition- al rod structure has serious optical distortion, including thermal focusing, double focusing caused by stress,stress birefringence. The slab structure can reduce the impact of these effects, and improve the quality of laser beam. The slab laser geometry permits efficient use of the unsaturated gain medium by u- sing angular multiplexing. Standard methods, such as polarization multiplexing, require the beam to be near to retrace its path. This retracing can result in feedback into the oscillator source and will, lead to parasitic oscillation of the amplifier. These problems due to retracing its path can be reduced if using an- gular multiplexing. A passively Q switched laser with repetition frequency of 20 kHz, pulse duration of 2. 5 ns and average output power of 0.5 W is used as the master oscillator. Comparing the two ways of three-pass amplifications,we realize a method to effectively amplify the seed laser with nanosecond pulse duration and microjoule energy. When the seed laser is totally reflected in the Nd. YVO4 slab, the aver- age output power of 3.2 W is achieved. Compared with other methods,this method can obviously elimi- nate the thermal lensing effect and enhance the output power.

关 键 词： 激光放大器 多通放大 紧凑型 角度复用

领　　域： [电子电信]