基于增益光栅的单频自调Q激光器单频稳定性研究  

Single-Frequency Stability of Single-Frequency Self-Q-Switched Solid-State Lasers Based on Gain Gratings

作　　者：许云鹏 李之通 吴婷[1] 姜梦华[1] 惠勇凌[1] 雷訇[1] 李强[1] Xu Yunpeng, Li Zhitong, Wu Ting, Jiang Menghua, Hui Yongling, Lei Hong, Li Qiang(Institute of Laser Engineering, Beijing University of Technology, Beijing 100124, China)

机构地区：[1]北京工业大学激光工程研究院,北京100124

出　　处：《中国激光》2018年第9期199-205,共7页Chinese Journal of Lasers

基　　金：国家自然科学基金(61378023);北京市自然科学基金(KZ201610005006;4174085)

摘　　要：研究发现,空间光束在增益介质中相互干涉,产生空间烧孔现象,形成增益光栅。简并的四波混频作用形成的增益光栅在谐振腔内多次振荡后,具有产生自调Q、自适应、窄化带宽和相位共轭激光输出的能力。在掠入射式结构的非互易式激光谐振腔中,采用脉冲抽运单块Nd…YVO4晶体,利用增益光栅的上述特性,分析了影响输出单频稳定性和输出能量的因素,通过优化非互易式器件消光比、增益区域大小、自交叉光夹角等条件实现了单脉冲能量为0.9mJ、脉宽为7.5ns、线宽为0.95pm的稳定的单纵模调Q输出。在本研究检索范围内,这是目前单块增益介质实现的最大能量,可为非互易式增益光栅激光器稳定的单纵模振荡的分析和优化提供参考。Recent studies have revealed that space beam interferenced in the gain medium would result in space burning hole phenomenon and form the gain grating.The gain grating formed by the four-wave mixing function after multiple oscillations in the resonator has self-adaptive,self-Q-switched and spatial filtering capabilities,and can obtain holographic conjugate output.Based on the above characteristics of the gain gratings in a non-reciprocal laser cavity with a grazing incidence structure,we analyze the factors which affect the output single-frequency stability and output energy with diode-pumped monolithic NdYVO4 crystal,and achieve a single-longitudinal-mode Qswitched output with a single pulse energy of 0.9 mJ,apulse width of 7.5 ns,and a line width of 0.95 pm by optimizing the extinction ratio of the non-reciprocal element,the gain area,the size of self-intersecting angle and other conditions.As far as reviewed,this is the maximum energy achieved by the current monolithic gain media,which can provide references for analyzing and optimizing the single-longitudinal mode oscillations to achieve stable non-reciprocal gain grating lasers.

关 键 词：激光器 激光光学 固体激光器 增益光栅 单纵模 掠入射 

分 类 号：TN248.1[电子电信—物理电子学]