在超短脉冲抽运光作用下,利用双光子激发研究了多晶金刚石非线性吸收和非线性折射的动力学演化过程。在非线性吸收动力学实验中，观察到了金刚石样品中被激发载流子的两个不同的复合过程，时间尺度分别在百皮秒量级和纳秒量级，精确得到了不同抽运光能量作用时两个过程各自的时间常数。在非线性折射动力学实验中，观察到了金刚石样品中由非简并双光子吸收过程所引起的正的非线性折射率变化，得到了样品的三阶非线性系数。

Under the action of ultrashort-pulse pump light, the dynamical evolution processes of nonlinear absorption and nonlinear refraction of polycrystalline diamond are studied by using two-photon excitation. In the dynamic experiment of nonlinear absorption, two different recombining processes of activated carriers are observed in the diamond sample, whose time scales are hundreds of picosecond scale and nanosecond scale, respectively, and the time constant of each process under the action of pump light with different energies is obtained accurately. In the dynamic experiment of nonlinear refraction, the positive change of nonlinear refractive index induced by the nondegenerate two-photon absorption process is observed and the third order nonlinear coefficient of the sample is obtained.