辐射雾对激光吸收特性的研究

Study on the Absorption of Laser in the Radiation Fog

为了得到辐射雾对激光的吸收特性,本文根据Maxwell-Garnett公式计算了高频条件下辐射雾中等效介电常数,然后由等效介电常数得到激光在雾中的吸收率,最后通过MATLAB平台进行数值模拟得出了直观的结果。结果表明,辐射雾对激光的吸收率与辐射雾中等效介电常数的虚部有关,且与其虚部成正比关系;辐射雾对激光的吸收率与辐射雾的可见度成正比;随着频率的增加,辐射雾对激光的吸收率迅速增大,在5THz时达到最大值,随后逐渐减小,最后趋于一个稳定值。

This paper presents the simulated laser absorption coefficient of the radiation fog in the THz regime.The results are obtained based on the effective dielectric constant of the mixture,which is calculated using the Maxwell-Garnett formula in high frequency regime.Our numerical result based on MATLAB simulation suggests that the laser absorption is proportional to the imaginary part of effective dielectric constant,as well as the visibility of the fog.We also calculated the frequency-dependent absorption coefficient,which shows a peak feature at about 5THz and saturates to a small value at high frequencies.