研究了二维随机介质中双色辐射特性以及模式竞争特性。基于随机激光的时域理论，建立了双波长随机激光辐射的理论模型。利用时域有限差分（FDTD）方法求解麦克斯韦方程与速率方程，采用傅里叶变换方式获得随机激光的发射谱，讨论了染料浓度、表面填充率以及散射颗粒半径对辐射光波的影响。结果表明，随着染料浓度的增大，短波长辐射光强度会降低而长波长辐射光强度会提高；表面填充率的增大会使两种波长的辐射光强度同时提高，并没有表现出偏向性，而散射颗粒半径对发射谱的影响则表现出明显的波长选择性。

The characteristics of dual-color emission and mode competition in two-dimensional random medium are studied. Based on the time-dependent theory, a model for dual-wavelength random laser is established. The Maxwell equations and rate equations are combined and solved by using the finite different time domain (FDTD) method. Light emission spectrum is calculated by Fourier transform. The effects of dye concentration, surface filling-fraction and scatterer radius on random laser emission are discussed. Results show that the emission intensity of long wavelength increases while that of short wavelength decreases with the dye concentration raising . The surface filling-fraction increase the emission intensity and has the same effect on different wavelengths, while the effect of the scatterer radius on the emission spectrum is wavelength dependent.