基于缺陷镜的空心结构光束直接产生研究  

Research on direct generation of hollow structured laser beam based on a spot defect mirror

作　　者：周伦滨 王冬 徐斌 廖廷俤 ZHOU Lunbin;WANG Dong;XU Bin;LIAO Tingdi(School of Electronic Science and Engineering,Xiamen University,Xiamen 361005,China;Research Center of Photonics Technology,Quanzhou Normal University,Quanzhou 362000,China)

机构地区：[1]厦门大学电子科学与技术学院,福建厦门361005 [2]泉州师范学院光子技术研究中心,福建泉州362000

出　　处：《量子电子学报》2022年第1期142-149,共8页Chinese Journal of Quantum Electronics

基　　金：深圳大学二维材料光电科技国际合作联合实验室开放课题,2DMOST2018026;福建省先进微纳光子技术与器件重点实验室开放课题,AMPTD202001。

摘　　要：空心光束是一种重要的结构光,是光场调控研究领域的热点之一。拉盖尔-高斯光束是一种典型的空心光束,因其螺旋状相位且携带轨道角动量,因而也被称为涡旋光。涡旋光在光通信、量子纠缠和超分辨成像等领域有着极高的应用价值。本研究以全固态两镜凹平腔Nd:YVO;激光器作为实验平台,通过在输出平面镜上制造点缺陷,达到抑制低阶高斯模式起振,从而获得高阶拉盖尔-高斯涡旋激光输出的效果。在连续波情况下,最高获得了16阶涡旋激光输出;在吸收功率为3.3 W时,获得最高功率为280 mW,激光斜效率为18.6%。进一步通过在谐振腔中插入Cr:YAG可饱和吸收体,首次演示了具有正反手性的拉盖尔-高斯同时被动调Q脉冲激光,稳定输出的最短脉冲宽度约为232 ns,相应的脉冲重复频率约为229.1 kHz。本研究表明点缺陷镜是一种稳定可靠的直接产生高阶涡旋光的手段,并且可以与被动调Q等固体激光技术结合产生不同运转方式的空间结构光束。Hollow beam is an important structured light and also one of the hot research topics in the field of light field manipulation.As a typical hollow beam,Laguerre-Gaussian beam is also named vortex beam because of its helical phase.Moreover,because of carrying orbital angular momentum,vortex beam is tremendously valuable in optical communication,quantum entanglement and super-resolution imaging.In this work,based on the all-solid-state two-mirror concave-plane Nd:YVO;laser experimental platform,the continuous-wave 16 th-order vortex laser is obtained by fabricating some spot defects onto the output coupler to suppress the low-order Gaussian mode and force the operation of high-order Laguerre-Gaussian vortex laser.A maximum output power of 280 mW is achieved with a slope efficiency of 18.6%at an absorbed power of 3.3 W.Furthermore,a passive Q-switched high-order Laguerre-Gaussian laser with positive and negative handedness is demonstrated for the first time by inserting a Cr:YAG crystal into the laser cavity as a saturable absorber,and the shortest pulse width of the pulsed laser is 232 ns at a repetition rate of 229.1 kHz.The research indicates that spot defect mirror is a stable and reliable measures for direct generation of high-order vortex lasers.Moreover,it can be combined with other solid-state laser technology such as passive Q switching to produce spatially structured light operating at different regimes.

关 键 词：量子光学 光场调控 点缺陷镜 空心光束 涡旋光 连续波 被动调Q 

分 类 号：O431.2[机械工程—光学工程]