研究两能级原子与环境(热辐射场)简并双光子作用时采用非旋波近似,通过外加驱动场,分析置于热辐射场中的两能级原子约化密度算符非对角元的时间演化,得到原子在热辐射场中的相干特性.当外加驱动场的时间演化满足一定条件时,可保持两能级原子在双光子过程中的相干性.
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