摘要
设计了一种高效率、结构紧凑的高功率激光放大器。采用解析方法分析了对称结构Nd:YAG双包层平面波导增益介质的内部热应力,获得了其可承受的最大抽运光强。针对不同厚度的内包层结构,采用Trace Pro软件模拟分析得到了最佳的抽运源结构和耦合系统。为了便于进行激光模式控制,掺杂区厚度取为100μm。内包层和外包层分别为纯YAG和蓝宝石,整个波导尺寸为60 mm×10 mm×2 mm。半导体激光器阵列输出的抽运光从波导的两个端面进入,两个大面和铜热沉焊接来获得良好的散热条件。种子光从一个端面注入,单通放大输出。通过模拟计算,在3384 W的抽运功率下,进入波导芯层的种子光功率为0.1 W,放大输出功率可以到达1322 W,光光效率约为39%。
A high power laser amplifier with high efficiency and compactness is designed. The thermal stress of symmetrical double cladding planar waveguide with Nd：YAG as its core is analyzed theoretically, and the maximum pump light intensity is also obtained. For different inner cladding thicknesses, the optimized pump sources and coupling system are achieved with the simulation of the TracePro software. In order to control the laser mode effectively, the 100 μm thickness of the core is set. The inner cladding and outer cladding are pure YAG and sapphire, respectively, with the waveguide of the dimension of 60 mm×10 mm×2 mm. The pump light from the laser diode array is coupled into the waveguide from two ends, two surfaces of the outer cladding are welded with two copper heat sinks for heat transfer. The seed light is coupled into the waveguide from one end and amplified for single pass. By theoretical calculation, the output of 1322 W can be obtained when the pump power is 3384 W and the seeder power into the waveguide is 0.1 W, with the optical-optical efficiency of 39%.
出处
《中国激光》
EI
CAS
CSCD
北大核心
2015年第1期79-87,共9页
Chinese Journal of Lasers
关键词
激光器
固体激光器
平面波导
热应力
lasers
solid-state laser
planar waveguide
thermal stress
