论文部分内容阅读
2μm激光器作为中波红外固体激光器的泵浦源方案之一,由于可以获得较高的中波红外激光输出,因此逐渐得到重视。设计了一种基于1 940nm光纤激光器泵浦的高平均功率准连续Ho∶YLF激光器,并对其进行了实验研究,表明在Ho离子掺杂浓度0.5%、晶体长度35mm、晶体控温20℃时,采用双棒串接、平凹腔L型结构获得了36 W的准连续2.067μm激光输出,其最高光光转换效率为51.4%,重复频率20kHz,脉冲宽度121ns,谱线宽度小于3nm。实验结果验证了采用1 940nm光纤激光器泵浦作为泵浦Ho∶YLF获得高功率准连续2μm激光的可行性。
As one of the pump sources of medium-wave infrared solid-state lasers, the 2μm laser has gained more and more attention due to its high mid-wave infrared laser output. A high average-power quasi-continuous Ho:YLF laser pumped by a 1 940nm fiber laser was designed and experimentally studied. It is found that when the Ho ion doping concentration is 0.5%, the crystal length is 35mm and the crystal temperature is 20 ℃ , A double wedge series and flat cavity L type structure was used to obtain a 36 W quasi-continuous 2.067μm laser with a maximum optical conversion efficiency of 51.4%, a repetition frequency of 20kHz, a pulse width of 121ns and a spectral width of less than 3nm. Experimental results verify the feasibility of using a 1 940 nm fiber laser pump as a pump Ho: YLF to obtain a high-power quasi-continuous 2 μm laser.