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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 two-color radiation characteristics and mode competition properties in two-dimensional random media are studied. Based on the time-domain theory of stochastic laser, a theoretical model of two-wavelength stochastic laser radiation is established. The time-domain finite difference (FDTD) method was used to solve the Maxwell equation and the velocity equation. The emission spectra of the random laser were obtained by Fourier transform. The effects of dye concentration, surface filling ratio and scattering particle radius on the radiant wave were discussed. The results show that with the increase of dye concentration, the intensity of the short-wavelength radiation will decrease and the intensity of the long-wavelength radiation will increase. The increase of the surface filling rate will increase the intensity of the radiation at the two wavelengths at the same time without showing the bias , While the influence of scattering particle radius on the emission spectrum shows obvious wavelength selectivity.