Fig. 1. Three dimensional diagrams for the total electric field (red), gating field (green), and driving field (blue) in polarization gating pulse as a function of time: (a) 5 fs pulse width and 5 fs time delay; (c) 10 fs pulse width and 22.5 fs time delay; (e) 10 fs pulse width and 15 fs time delay. Panels (b), (d), (f) correspond to the driving electric field versus time in panels (a), (c), (e), respectively (shaded portion is polarization gate).偏振控制脉冲总电场(红色曲线)、控制场(绿色曲线)及驱动场(蓝色曲线)随时间变化三维图　(a) 5 fs脉宽和5 fs时间延迟; (c) 10 fs脉宽和22.5 fs时间延迟; (e) 10 fs脉宽和15 fs时间延迟; (b), (d), (f)显示了与(a), (c), (e)图相对应的驱动脉冲电场随时间变化曲线图(阴影部分是偏振门)

Fig. 2. High order harmonic generation from helium atom in a polarization gating pulse with 10 fs pulse width. The black curve is from the polarization gate width , the red curve is from the polarization gate width δt_G = 0.82T₀. 脉宽为10 fs的偏振控制脉冲与氦原子相互作用得到的高次谐波发射光谱, 其中黑线表示δt_G = T₀/2的偏振控制脉冲, 红线表示δt_G = 0.82T₀的偏振控制脉冲

Fig. 3. Evolution of the harmonics with ionization (black) and recombination (red) time.谐波阶次随电离时刻及复合时刻的变化关系图

Fig. 4. Atomic ionization probability (red line), electric field of driving pulse (black line), ellipticity (blue line) in the polarization gate as function of time: (a) Symmetric polarization gating scheme δt_G = 0.5T₀; (b) symmetric polarization gating scheme δt_G = 0.82T₀; (c) asymmetric polarization gating scheme δt_G = 0.82T₀. 偏振门内原子电离概率(红线)、驱动脉冲电场(黑线)、椭偏率(蓝线)随时间变化曲线　(a)对称偏振控制方案δt_G = 0.5T₀; (b)对称偏振控制方案δt_G = 0.82T₀; (c)不对称偏振控制方案δt_G = 0.82T₀

Fig. 5. (a) Three-dimensional diagrams for the total electric field (red curve), gating field (green curve) and driving field (blue curve) in the asymmetric polarization gating pulse as a function of time; (b) high harmonic emission spectra.(a)不对称偏振控制脉冲总电场(红色曲线)、控制场(绿色曲线)及驱动场(蓝色曲线)随时间变化三维图; (b)高次谐波发射谱

Fig. 6. Time-frequency analysis of harmonic emission in asymmetric polarization gating scheme.不对称偏振控制方案中谐波发射的时频分析图像

Fig. 7. Attosecond pulse generation from (a) asymmetric polarization gating scheme and (b) symmetric polarization gating scheme.阿秒脉冲产生时域图　(a)不对称偏振控制方案; (b)对称偏振控制方案