Chetty D, Glover R D, Tong X M, deHarak B A, Xu H, Haram N, Bartschat K, Palmer A J, Luiten A N, Light P S, Litvinyuk I V, Sang R T
Centre for Quantum Dynamics, Griffith University, Brisbane, Queensland 4111, Australia.
Institute for Photonics and Advanced Sensing and School of Physical Sciences, The University of Adelaide, Adelaide, South Australia 5005, Australia.
Phys Rev Lett. 2022 Apr 29;128(17):173201. doi: 10.1103/PhysRevLett.128.173201.
We present a joint experimental-theoretical study on the effect of the carrier-envelope phase (CEP) of a few-cycle pulse on the atomic excitation process. We focus on the excitation rates of argon at intensities in the transition between the multiphoton and tunneling regimes. Through numerical simulations, we show that the resulting bound-state population is highly sensitive to both the intensity and the CEP. The experimental data clearly agree with the theoretical prediction, and the results encourage the use of precisely tailored laser fields to coherently control the strong-field excitation process. We find a markedly different behavior for the CEP-dependent bound-state population at low and high intensities with a clear boundary, which we attribute to the transition from the multiphoton to the tunneling regime.
我们展示了一项关于少周期脉冲的载波包络相位（CEP）对原子激发过程影响的联合实验与理论研究。我们关注在多光子和隧穿区域之间过渡强度下氩气的激发率。通过数值模拟，我们表明所产生的束缚态布居对强度和CEP都高度敏感。实验数据与理论预测明显吻合，这些结果促使人们使用精确定制的激光场来相干控制强场激发过程。我们发现，在低强度和高强度下，依赖于CEP的束缚态布居表现出明显不同的行为，且存在一个清晰的边界，我们将其归因于从多光子区域到隧穿区域的转变。
