表层掺杂板条状激光模块仿真研究分析

介绍了一种表层增益板条状激光器模块。提出一种结合光线追迹、有限元、数值分析的仿真方法,建立表层增益激光增益模块的模型。在求解抽运光在该结构内部的分布情况以及其温度场的分布情况时,发现与传统体掺杂的CCEPS结构相比,表层增益激光模块有较高的散热能力以及较低的光学畸变。     

Yb∶YAG板条高亮度均匀泵浦耦合技术研究

针对Yb∶YAG板条增益模块的特性,开展了高亮度均匀泵浦耦合系统的设计与实验研究。通过理论计算发现泵浦的功率密度与Yb∶YAG的激光提取效率有关。为提高泵浦亮度,采用空间/偏振复合拼接方式实现将4个LD进行合束。实验获得合束后激光二极管的总功率为25 kW,合束效率约为90 %。证明的该结构有效的解决目前Yb∶YAG板条激光晶体因泵浦功率低下而导致的功率和效率下降的问题。     

10 kW级表层掺杂板条激光放大器研究

报道了一种在室温下运转的高功率Yb∶YAG表层掺杂板条激光放大器,该放大器基于主振荡功率放大结构(MOPA),以光纤激光器作为种子源,种子光经预放大器放大后,再进入表层掺杂板条中进行功率放大。建立了放大器增益模块的提取功率和提取效率的理论模型,并进行了实验研究。放大器在3.5 kW的1030 nm信号光注入和22.4 kW的940 nm激光二极管抽运条件下,输出激光功率10.6 kW,从单增益模块中提取功率7.1 kW,提取效率达到31.7%,实验结果和理论计算结果基本相符。同时对板条的透射波前进行了测量,PV=1.6μm。     

Improving the performance of high-power broad-area lasers by suppressing cavity modes propagating in the lateral dimension

We first study the effect of cavity modes propagating in the lateral dimension on high-power semiconductor lasers with a large stripe width. A sidewall microstructure was fabricated to prevent optical feedback of lateral resonant modes.Theoretically, we demonstrate the existence of lateral resonant modes in the Fabry–Perot cavity with a large stripe width.Experimentally, we design the corresponding devices and compare them with conventional broad-area diode lasers. About a 15% reduction in thres...     

High efficiency of spectral beam combining by using large optical cavity lasers

We studied the spectral beam combining [SBC) of a large optical cavity [LOC) laser array to achieve high-power and highbrightness laser output. We discussed the characteristics of the external cavity feedback efficiency and the focal length of the transform lens for lasers with different waveguide thicknesses. We have found that using LOC laser diodes can increase the proportion of external cavity feedback, thereby improving the SBC efficiency. At a current of 90 A, the CW output power of the SB...     

6.1 kW CW laser amplifier chain based on Yb:YAG surface-doped slab

In this paper, we present a diode-pump continuous wave laser amplifier chain where master the oscillator power amplifier(MOPA) architecture is used. The laser amplifier chain consists of two Yb:YAG surface-doped slab laser modules and the 1030 nm fiber laser is used as seed. We theoretically calculate the conditions for obtaining high output l aser power and systematically analyze the advantages of surface-doped slab. The maximum output power is 6.1 kW and the optical to optical conversion efficiency is 27% when the pump power is 22 kW at room temperature. The beam quality(β) is 2.8 times diffraction limit. These results demonstrate that the surface-doped slab structure has the potential to obtain high output laser power.