Fig. 1. (a) Intensity distributions of the CAB at the initial plane; (b) phase distributions of the CAB at the initial plane; (c) intensity distributions of the CAB during propagation in the r-z plane. (a) CAB初始面的光强分布; (b) CAB初始面的相位分布; (c) CAB的侧面光强分布

Fig. 2. Schematic of the laser resonator configuration for CAB generation.谐振腔示意图

Fig. 3. Calculation results of the intensity distributions of the modes by using Fox-Li method with different parameters: (a) r₀ = 1 mm, w = 0.2 mm and a = 0.15; (b) r₀ = 1.1 mm, w = 0.22 mm and a = 0.17; (c) r₀ = 1.2 mm, w = 0.25 mm and a = 0.2. 不同参数条件下, 使用Fox-Li方法计算获得的腔内光场模式分布　(a) r₀ = 1 mm, w = 0.2 mm和a = 0.15; (b) r₀ = 1.1 mm, w = 0.22 mm和a = 0.17; (c) r₀ = 1.2 mm, w = 0.25 mm和a = 0.2

Fig. 4. Radial intensity distributions of the ideal CAB and the beams produced by different methods: (a) r₀ = 1 mm, w = 0.2 mm and a = 0.15; (b) r₀ = 1.1 mm, w = 0.22 mm and a = 0.17; (c) r₀ = 1.2 mm, w = 0.25 mm and a = 0.2. 理想CAB和使用不同方法产生的光束的径向光强分布　(a) r₀ = 1 mm, w = 0.2 mm和a = 0.15; (b) r₀ = 1.1 mm, w = 0.22 mm和a = 0.17; (c) r₀ = 1.2 mm, w = 0.25 mm和a = 0.2

Fig. 5. On-axis intensity contrast of the ideal CAB and the beams produced by different methods: (a) r₀ = 1 mm, w = 0.2 mm and a = 0.15; (b) r₀ = 1.1 mm, w = 0.22 mm and a = 0.17; (c) r₀ = 1.2 mm, w = 0.25 mm and a = 0.2. 理想CAB和使用不同方法产生的光束的光轴光强分布　(a) r₀ = 1 mm, w = 0.2 mm和a = 0.15; (b) r₀ = 1.1 mm, w = 0.22 mm和a = 0.17; (c) r₀ = 1.2 mm, w = 0.25 mm和a = 0.2

Fig. 6. The influence of the alignment errors on formation of the fundamental mode with , and : (a) and S of the fundamental mode as a function of ; (b) and S of the fundamental mode as a function of 光束参数为 , 和 时, 系统对准误差对产生光束质量的影响　(a)基模的 以及S与腔长误差 的关系; (b)基模的 以及S与同轴度误差 的关系

Fig. 7. and S of the fundamental mode as a function of . 基模的 以及S与 的关系