Fig. 1. (a) Five regions; (b) refractive index variance in five regions. (a)五个区域; (b)五个区域的折射率方差

Fig. 2. Refractive index variance in different regions: (a) Head area 1; (b) side area 2. 折射率方差 　(a)头部区域1; (b)侧部区域2

Fig. 3. Intensity distribution of S-FFT and D-FFT algorithm at different diffraction distances: (a) S-FFT, = 100 mm; (b) D-FFT, = 100 mm; (c) S-FFT, = 10 mm; (d) D-FFT, = 10 mm. 在不同衍射距离下S-FFT和D-FFT两种算法的光强分布　(a) S-FFT, = 100 mm; (b) D-FFT, = 100 mm; (c) S-FFT, = 10 mm; (d) D-FFT, = 10 mm

Fig. 4. Schematic diagram of multi-random phase screen.多随机相位屏示意图

Fig. 5. Numerical simulation of intensity of Gaussian beam in different propagation conditions: (a) λ = 1.55 × 10^–6 m, ω₀ = 40 mm, d = 13 mm; (b) ω₀ = 40 mm, d = 13 mm, = 10^–12; (c) λ = 1.55 × 10^–6 m, ω₀ = 40 mm, = 10^–12. 不同传输条件时的高斯光束光强数值仿真　(a) λ = 1.55 × 10^–6 m, ω₀ = 40 mm, d = 13 mm; (b) ω₀ = 40 mm, d = 13 mm, = 10^–12; (c) λ = 1.55 × 10^–6 m, ω₀ = 40 mm, = 10^–12