Tm∶YAP泵浦的窄脉宽高峰值功率Ho∶YLF激光器  

Ho∶YLF Laser with Narrow Pulse Width and High Peak Power Pumped by Tm∶YAP Laser

作　　者：赵莉莉 田俊涛 王海 李志永 谭荣清 Zhao Lili;Tian Juntao;Wang Hai;Li Zhiyong;Tan Rongqing(Laser Engineering Center,Aerospace Information Research Institute,Chinese Academy of Sciences,Beijing 100094,China;School of Electronic,Electrical and Communication Engineering,University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院空天信息创新研究院激光工程技术研究中心,北京100094 [2]中国科学院大学电子电气与通信工程学院,北京100049

出　　处：《中国激光》2023年第14期29-34,共6页Chinese Journal of Lasers

基　　金：国家自然科学基金(61875198,61775215);脉冲功率激光技术国家重点实验室开放基金(SKL2021KF04);中国科学院仪器设备研制项目(YJKYYQ20210045)。

摘　　要：2μm高峰值功率激光在中长波光参量振荡器泵浦和光电对抗领域中具有重要应用。采用线偏振Tm∶YAP激光泵浦Ho∶YLF晶体的技术路线,基于电光调Q技术,通过泵浦光的偏振方向优化,在泵浦功率为15.4 W时,实现了脉冲能量为9.5 mJ、重复频率为100 Hz、脉冲宽度为13.0 ns的2.05μm激光输出,水平和竖直方向上的光束质量因子分别为1.2和1.3,对应的峰值功率为0.73 MW。该激光器具有峰值功率高、结构简单紧凑的优点,为将来实现更高能量和更高峰值功率的Ho∶YLF激光输出提供了实验参考数据。Objective High-energy and high-peak-power 2 μm solid-state laser plays an important role in many fields.Currently,two types of pumping source can be used to pump an Ho∶YLF laser.One is the Tm doped solid-state laser,and the other is the Tm doped-fiber laser.It is known that Ho∶YLF crystal has different polarized absorption characteristics in the π and σ directions.Therefore,quantitative research on the optical-optical conversion efficiencies affected by the polarization of the pump light will be remarkably significant.Electro-and acousto-optic Q-switching are two methods for realizing pulsed output of Ho∶YLF laser.The former method has advantages in terms narrower-pulse-width laser output.Therefore,we demonstrate an electro-optic Q-switched Ho∶YLF laser pumped by Tm∶YAP laser,and a laser output with high-peak-power and narrow-pulse-width is obtained.A peak power of megawatt level is achieved at a lower pump power by adopting the technical scheme.Moreover,the laser has a compact configuration.It will potentially provide a high-quality laser source for the application of mid-and long-infrared optical parametric oscillators,laser radar,and other fields.Methods This study develops layouts of the Ho-laser based on an end-pumped structure with L-shape resonator.The experimental device is depicted in Fig.2.A home-made Tm∶YAP solid-state laser at wavelength 1.94 μm is used as a pumping source.The dimensions of the Tm∶YAP crystal are 3 mm×3 mm×12 mm,and the doping concentration(atomic fraction) is 3.0%.The Tm∶YAP crystal is b-cut.The dimensions of the Ho∶YLF crystal are 6 mm×6 mm×40 mm.The Ho∶YLF crystal is a-cut,and the doping concentration(atomic fraction) is 0.5%.The M4 mirror is a half-wave plate and is used to examine the effect of polarization on the output characteristics of the Ho∶YLF laser.To achieve good mode matching,the size of the pump light spot is adjusted to be approximately 1.2 times the size of the Ho∶YLF laser spot.We select an RbTiOPO4(RTP) crystal as the electro-optic Q

关 键 词：激光器 Ho∶YLF激光器 高峰值功率 电光调Q 

分 类 号：O439[机械工程—光学工程]