Schuh K, Scheller M, Hader J, Moloney J V, Koch S W
Department of Mathematics, Arizona Center for Mathematical Sciences, University of Arizona, Tucson, Arizona 85721, USA and College of Optical Sciences, University of Arizona, Tucson, Arizona 85721, USA.
College of Optical Sciences, University of Arizona, Tucson, Arizona 85721, USA and Department of Physics and Material Science Center, Philipps-University, 35032 Marburg, Germany.
Phys Rev E Stat Nonlin Soft Matter Phys. 2013 Dec;88(6):063102. doi: 10.1103/PhysRevE.88.063102. Epub 2013 Dec 5.
A microscopic model is developed to analyze terahertz (THz) emission after ultrashort one- and two-color laser-pulse excitations of an atomic gas. Optical Bloch equations are derived to describe the pulse-induced ionization in the many-atom system including the Coulombic scattering of the ionized electrons. The model captures the continuous transition between the tunneling and the multiphoton ionization regimes. Numerical evaluations for a wide range of pulse configurations identify optimized excitation conditions for strong THz emission.
开发了一种微观模型，用于分析原子气体在超短单双色激光脉冲激发后的太赫兹（THz）发射。推导了光学布洛赫方程，以描述多原子系统中脉冲诱导的电离，包括电离电子的库仑散射。该模型捕捉了隧穿和多光子电离区域之间的连续转变。对各种脉冲配置的数值评估确定了强太赫兹发射的优化激发条件。
