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凝聚态物质体系中飞秒量级相干态相位特性的研究，无疑是光学瞬态相于过程和相干控制的研究的重要发展方向．最近，由于稳定的飞秒固体激光器的发展，使人们能够在飞秒和亚飞秒尺度研究相干态的相位动力学特性．非线性四波混频（FMM）是用飞秒脉冲研究超快弛豫和相干退相过程最
The study of the phase characteristics of the femtosecond order coherent states in the condensed matter system is undoubtedly an important development direction of the research on optical transient phase processes and coherent control. Recently, due to the development of stable femtosecond solid-state lasers, one has been able to study the phase dynamics of coherent states at the femtosecond and sub-femtosecond scales. Nonlinear four-wave mixing (FMM) is the use of femtosecond pulses to study the processes of ultra-fast relaxation and coherent annealing