高功率射频板条CO_(2)激光器Donut模式整形的研究  

Research on High Power RF-Excited Slab CO_(2) Laser for Generation of A Donut Mode Beam

作　　者：王炜 万文 何琼[1] 杨晟[1] 李勇[1] 石金发[1] Wang Wei;Wan Wen;He Qiong;Yang Sheng;Li Yong;Shi Jinfa(School of Electronic Engineering,Wuhan Vocational College of Software and Engineering,Wuhan,Hubei 430205,China)

机构地区：[1]武汉软件工程职业学院电子工程学院,湖北武汉430205

出　　处：《应用激光》2022年第7期147-153,共7页Applied Laser

基　　金：武汉市科学技术局应用基础前沿专项(2019010701011383)。

摘　　要：Donut模式为环形能量分布,具有携带和光轴相对应的轨道角动量的能力,使得它在科学研究、激光加工等领域广受关注。分别使用衍射光学元件和螺旋相位片,将高功率射频板条CO_(2)激光器输出的近似高斯基模进行整形获得Donut模式,对整形光束的传输特性、光束质量、整形效率进行了分析。结果表明:采用G-S算法设计的类似环形凹面镜结构的衍射光学镜片,整形光束的近场传输特性不理想;而通过螺旋相位片的方式最终获得了近场传输特性较好的Donut模式,同时Donut模式远场特性较为理想,整形效率为97.1%,光束M^(2)因子为2.29。Donut mode with annular shaped light distribution has the ability to carry the orbital angular momentum corresponding to the optical axis,which has attracted wide attention in scientific research,laser processing and other fields.In this paper,a diffractive optical element and a spiral phase plate have been used respectively to convert the mode similar to fundamental Gaussian beam into the Donut mode beam,while the propagation characteristics,beam quality,and efficiency of beam shaping for the shaped beam are analyzed.The results show that near-field propagation characteristics of the shaped beam are unacceptable when use the diffractive optical element which similar to the ring-shaped concave mirror structure designed by the G-S algorithm.However,better near-field propagation characteristics of the Donut mode beam is finally obtained through the spiral phase plate,and the far-field characteristics of Donut mode beam are relatively ideal.The efficiency of beam shaping is 97.1%,and the beam quality M^(2) factor is 2.29.

关 键 词：激光光学 光束整形 Donut模式 传输特性 

分 类 号：TN242[电子电信—物理电子学]