在非线性光学表述中，通常用四阶张量的复数矩阵元表示三阶非线性，但传统的三阶非线性测量技术如四波混频（ＦＷＭ）仅能给出三阶非线性的绝对值．我们提出并发展了用双色ＦＷＭ方法进行相位敏感测量，并可获得三阶非线性系数的实部和虚部，我们用该项技术进行了高灵敏度喇曼 In nonlinear optical representations, third-order nonlinearities are usually represented by complex matrix elements of fourth-order tensors, but traditional third-order nonlinear measurement techniques such as four-wave mixing (FWM) give only third-order nonlinear absolutes value. We propose and develop phase-sensitive measurements using the two-color FWM method and obtain the real and imaginary parts of the third-order nonlinear coefficients. Using this technique, we performed a high-sensitivity Raman