【摘要】 高峰值功率、高稳定性以及优越光束质量的激光光源是材料加工与处理的理想选择。利用重复频率为120 k Hz、脉宽为220 ps、平均功率为26μW的种子光源,经过光纤和固体组成的混合放大系统,最终得到平均功率为39.2 W的激光输出,峰值功率达到1.5 MW。预放大器由两级光纤放大器组成,功率放大器为四级端面抽运的Nd:YVO4固体放大器,通过控制晶体掺杂浓度、晶体温度以及抽运光束直径,并且调节各个放大级中的填充因子,最终得到输出光束的光束质量因子为M2=1.3。更多还原

【Abstract】 High peak power, high stability laser beams with excellent beam quality are ideal choices for material manufacturing and processing. A semiconductor laser with repetition frequency of 120 k Hz, pulse width of 220 ps, average power of 26 μW is used as seed source. The pre- amplifier consists of two fiber amplifiers. The power amplifier consists of four stages end- pumped Nd:YVO4solid amplifiers. The average power of final laser output is up to 39.2 W with peak power of 1.5 MW. By optimizing the crystal doping concentration, crystal temperature, the pump beam diameter and beam filling factor in each solid amplifier, the output beam with M2 factor of 1.3 is achieved.更多还原