为了研究碳纳米管悬浮液的光限幅机理，测量了碳纳米管悬浮液的散射能量和透射能量随入射激光能量密度的变化曲线，得到了不同入射激光能量密度下，散射光能量在平行于入射线偏振光偏振方向的散射面内的角度分布，并对碳纳米管悬浮液进行了探针光实验。根据米氏散射理论，计算了在不同大小的散射中心下，碳纳米管悬浮液的散射光能量在平行于入射线偏振光偏振方向的散射面内的角度分布，以及散射截面随散射中心半径大小的变化。结果表明，碳纳米管悬浮液光限幅可能源于碳纳米管吸收激光能量汽化形成的碳气泡引起的非线性散射。

To find out the optical limiting mechanism of carbon nanotube suspension,the scattered and transmitted energy for the carbon nanotube suspension,as a function of incident fluence,is measured. The angular scattering profile at different incident fluences for 10 ns,1064nm linearly polarized light parallel to the scattering plane is obtained and pump-probe timeresolved experiments also performed. Based on Mie theory,the scattering energy distribution and scattering cross-section varying with carbon vapour bubble radius is calculated,which qualitatively agree with experiment results. The results indicate that the optical limiting mechanism of carbon nanotube suspension probably originated from the nonlinear scattering of carbon vapour bubble formed by light absorption.