Attosecond Control of Orbital Parity Mix Interferences and the Relative Phase of Even and Odd Harmonics in an Attosecond Pulse Train
Attosecond Control of Orbital Parity Mix Interferences and the Relative Phase of Even and Odd Harmonics in an Attosecond Pulse Train
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DOI：
10.1103/physrevlett.109.083001
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发表时间：
2012-08-20
影响因子：
8.6
通讯作者：
Cocke, C. L.
中科院分区：
文献类型：
--
作者：
Laurent, G.;Cao, W.;Cocke, C. L.
我们的实验表明，原子轨道宇称混合干涉可以在阿秒时间尺度上进行时间控制。电子波包是在弱红外场作用下，用奇数和偶数高次谐波梳电离氩气而形成的。因此，能量简并的偶宇称态和奇宇称态的混合物通过单光子和双光子跃迁在连续谱中被馈送。这些干扰，导致沿极化矢量沿着的不对称电子发射。发射的方向可以通过改变梳状和红外场脉冲之间的时间延迟来控制。我们表明，这种不对称发射提供了阿秒脉冲中连续奇次和偶次谐波的相对相位信息
We experimentally demonstrate that atomic orbital parity mix interferences can be temporally controlled on an attosecond time scale. Electron wave packets are formed by ionizing argon gas with a comb of odd and even high-order harmonics, in the presence of a weak infrared field. Consequently, a mix of energy-degenerate even and odd parity states is fed in the continuum by one-and two-photon transitions. These interfere, leading to an asymmetric electron emission along the polarization vector. The direction of the emission can be controlled by varying the time delay between the comb and infrared field pulses. We show that such asymmetric emission provides information on the relative phase of consecutive odd and even order harmonics in the attosecond pulse