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首页> 外文期刊>Physical review letters >Optical Pattern Transitions from Modulation to Transverse Instabilities in Photorefractive Crystals
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Optical Pattern Transitions from Modulation to Transverse Instabilities in Photorefractive Crystals

机译:光折射晶体中光学图案从调制跃迁到横向不稳定性

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摘要

We show by experimental measurements and theoretical analyses that there exists a pattern transition from optical modulation instability to transverse instability in nonlinear media. An input coherent beam propagating in the photorefractive crystals is observed to break up into stripe filaments at a first threshold voltage. By modeling the periodic strip filaments as cnoidal waves, we demonstrate that a second threshold voltage for forming dot filaments comes from the transverse instability, resulting in a good agreement with the experimental data.
机译:我们通过实验测量和理论分析表明,在非线性介质中存在从光调制不稳定性到横向不稳定性的模式转变。观察到在光折射晶体中传播的输入相干光束在第一阈值电压下分裂成条状细丝。通过将周期性条状细丝建模为正弦波,我们证明了形成点状细丝的第二阈值电压来自横向不稳定性,从而与实验数据很好地吻合。

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