气体和真空中的四波相互作用。真空中三阶非线性有效极化率的定义
Four-wave interaction in gas and vacuum. Definition of a third order nonlinear effective susceptibility in vacuum
摘要：
用半经典方法研究了真空中光场在四波混频条件下的非线性相互作用。这项研究的动机是希望调查的可能性，使用最近开发的强大的超短（飞秒）激光脉冲来证明在真空中存在的非线性效应，预测量子电动力学（QED）。本文提出了一种类似于介质中经典非线性光学的方法。引入了真空的三阶非线性有效极化率。
英文摘要：
Semiclassical methods are used to study the nonlinear interaction of light in vacuum in the context of four wave mixing. This study is motivated by a desire to investigate the possibility of using recently developed powerful ultrashort (femtosecond) laser pulses to demonstrate the existence of nonlinear effects in vacuum, predicted by quantum electrodynamics (QED). An approach, similar to classical nonlinear optics in a medium, is developed in this article. A third order nonlinear effective susceptibility of vacuum is then introduced .
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