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当前测量阿秒脉冲宽度的方法大多基于基频光辅助原子的XUV光电离。我们采用由高强度的近红外激光和其 倍频光组成的双色激光场作为XUV光电离过程的辅助激光。数值模拟结果表明双色场辅助的XUV光电离能从垂直方向 探测到的光电子能谱出发有效地识别阿秒脉冲序列中脉冲的个数。
The current methods of measuring attosecond pulse widths are mostly based on the XUV photoionization of the fundamental-frequency optical-assisted atoms. We use a dual-color laser field consisting of a high-intensity near-infrared laser and its frequency doubling light as the auxiliary laser for the XUV photoionization process. The numerical simulation results show that the XUV photoionization assisted by the two-color field can effectively identify the number of pulses in the attosecond pulse sequence from the photoelectron spectrum detected in the vertical direction.