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arXiv physics/0606105physics.optics
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弱散射系统中的随机激光

Random lasing in weakly scattering systems

X. Wu, W. Fang, A. Yamilov, A. A. Chabanov, A. A. Asatryan, L. C. Botten, H. Cao

摘要:

我们对弱散射系统中的随机激光进行了详细的实验和数值研究。散射光的干涉在无源系统中很弱,但在高增益的存在下大大增强,为激光发射提供相干和谐振反馈。激光模式被限制在泵浦体积附近,在增益体积小于散射平均自由程的弹道区,激光振荡沿增益体积最大扩展的方向发生,产生定向激光输出。激光的反馈主要来源于泵浦区边界附近粒子的后向散射。它导致激光模式的频率间隔几乎恒定,这与增益体积的最大尺寸成反比。

英文摘要:

We present detailed experimental and numerical studies of random lasing in weakly scattering systems. The interference of scattered light, which is weak in the passive systems, is greatly enhanced in the presence of high gain, providing coherent and resonant feedback for lasing. The lasing modes are confined in the vicinity of the pumped volume due to absorption of emitted light outside it. In the ballistic regime where the size of gain volume is less than the scattering mean free path, lasing oscillation occurs along the direction in which the gain volume is most extended, producing directional laser output. The feedback for lasing originates mainly from backscattering of particles near the boundaries of pumped region. It results in nearly constant frequency spacing of lasing modes, which scales inversely with the maximum dimension of the gain volume.

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