Fig. 1. Sketch of the pump-probe setup (m1−m15, flat mirror; f1, flat-concave lens; f2, f3, convex lens).抽运探测实验示意图 (m1−m15, 平面高反镜; f1, 平凹透镜; f2, f3, 凸透镜)

Fig. 2. Arm length stabilization of a Mach-Zehnder interferometer (M1, concave lens; M2, convex lens; M3−M10, plane mirrors; P, polarizer; , half wave plate; FL, focusing lens; CW, continuous wave). 用532 nm连续激光干涉锁定光路示意图(M1, 凹透镜; M2, 凸透镜; BS, 分束片; M3−M10, 平面银镜; P, 偏振片; , 半波片; FL, 凸透镜; CW, 连续)

Fig. 3. Interferometer locking stability over 12 hours. Inset is the relative phase drift when armlength is not locked.用532 nm连续激光干涉锁定12 h的稳定性, 其中均方差为14.6 mrad, 插图为未锁定下的相对相位漂移

Fig. 4. Actual electric field of a few cycle laser pulse under different CEP values, which affect the electric field significantly.在同一脉冲包络下不同CEP值所对应的实际电场(CEP对少周期脉冲电场实际形状影响显著)

Fig. 5. f-2f setup diagram, where collinear design is applied to avoid delay variation. f-2f装置光路图(采用共线设计以避免延时变化)

Fig. 6. CEP offset over 20 minutes when CEP is locked using f-2f. f-2f锁定CEP20分钟的效果(均方差为227 mrad)