用倍频YAG脉冲激光泵浦导致三重态激发态对氦氖探测激光的非线性吸收，演示了曙红Ｙ凝胶薄片的光开关和光调制特性，并用速率方程进行动力学数值模拟，得到了与实验相符的结果.文中还讨论了提高光开关和光调制性能的途径.

All-optical switching and modulation bssed on the excited-state absorption in a slice of Eosin Y aerosol by using a frequency doubled Nd: YAG pump beam and a He-Ne laser probe beam have been demonstrated. While dynamic numerical simulation using rate equation have been accomplished, which is consistent with experiments. The methods for improving characteristics of optical switching and modulation are also discussed in this paper.