随机激光器中准态腔的阈值与其局域化程度的关系

Influence of spatial localization on the threshold of quasi-state cavities in random lasers

基于光波在有限随机介质中的局域化理论 ,利用有限时域差分法数值求解Maxwell方程组 ,研究了随机介质中的激光现象 ,分析了准态模的放大与其空间局域性的关系 .通过研究二维非增益随机介质中光波的局域化 ,确定了准态模的空间分布和频谱特征 .通过引入增益 ,研究了准态模的放大过程和阈值特性 .结果表明空间局域化强的准态模在增益介质中被优先放大 。

Laser phenomena in random media have been studied based on the localized theory for optical waves in finite random media. The relationship between spatial localization and amplification for quasi-state modes has been investigated by use of the finite difference time domain method. The spatial profile and the spectra characteristics of quasi-state modes are determined by analyzing the localized processes of optical light beams in random media without gain. The amplification and threshold of quasi-state modes are analyzed in random media with gain. Results show that the quasi-state mode with a stronger spatial localization has lower threshold and can be amplified preferentially.