The results show that under higher laser intensity, both the ATI and HOHG have plateau and cutoff, but under lower laser intensity, the HOHG has plateau and the ATI decreases monotonically.

• 较低激光强度作用下，谐波谱有平台而光电子能谱为单调下降的，激光强度较高时，两者都有平台，对应的平台区和截止位置相同。