%A Guo Zhi-Jian (郭志坚), Chen Zhang-Jin (陈长进), Zhou Xiao-Xin (周效信) %T Origin of diffraction fringes in two-dimensional photoelectronmomentum distributions for single ionization of atoms in few-cycle intense laser pulses %0 Journal Article %D 2014 %J Chin. Phys. B %R 10.1088/1674-1056/23/4/043201 %P 43201-043201 %V 23 %N 4 %U {https://cpb.iphy.ac.cn/CN/abstract/article_116059.shtml} %8 2014-04-15 %X We use the strong field approximation with a time window function controlling the release time of electrons to study the intra-cycle and inter-cycle interferences in few-cycle intense laser pulses impinging on He. The diffraction fringes, i.e., the vertical stripe-like structure, observed in the experimental two-dimensional photoelectron momentum distributions of Gopal et al. (2009 Phys. Rev. Lett. 103 053001) have been attributed to the interplay of the intra-and inter-cycle interferences. The pure numerical calculations by solving the time-dependent Schrödinger equation are also performed and the results are compared with the experimental measurements directly. It has been found that the position of the stripe-like structure can be used to determine the duration of the laser pulses used in experiments.