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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，且有较低的阈值.
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关键词:
- 随机激光器 /
- 准态模 /
- 随机介质中的光学特性
Laser phenomena in random media have been studied bas ed on the localized theory for optical waves in finite random media. The relatio n ship between spatial localization and amplification for quasi_state modes ha s been investigated by use of the finite difference time domain method. T he spatial profile and the spectra characteristics of quasi_state modes are dete r mined by analyzing the localized processes of optical light beams in random medi a without gain. The amplification and threshold of quasi_state modes are analyze d in random media with gain. Results show that the quasi_state mode with a stron ger spatial localization has lower threshold and can be amplified preferentially .-
Keywords:
- random lasers /
- quasi_state mode /
- optic al properties of random media
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