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首页> 外文期刊>Optics Communications: A Journal Devoted to the Rapid Publication of Short Contributions in the Field of Optics and Interaction of Light with Matter >Study of modulation instability in a temporally incoherent photorefractive ring resonator below the threshold with incoherent light
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Study of modulation instability in a temporally incoherent photorefractive ring resonator below the threshold with incoherent light

机译：在非相干光阈值以下的时间非相干光折射环形谐振器中调制不稳定性的研究

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摘要

Modulation instability (MI) and evolution of pattern formation inside a passive non-linear photorefractive ring resonator having cavity-length longer than the coherence length of the light circulating in the resonating cavity has been theoretically analyzed. Dynamics of the system below the threshold conditions have also been analyzed, numerically using linear perturbation theory for the Kerr-type non-linearity. The process of modulation instability in a temporally incoherent cavity below the cavity threshold and the influence of various parameters such as the cavity-length, intensity feedback of the perturbed wave field, amplitude of the incoming beam and spatial frequency on the gain factor and the spatial spectral density have also been studied. For the perturbed wave field, it has been found that the growth rate of MI increases with increase in the intensity feedback as well as the spatial frequency. It has also been found that increasing the intensity feedback of the perturbed wave field, for a given value of the spatial frequency, the spatial spectral density of the perturbation at the output of the non-linear medium increases with the shifting peak positions to the higher spatial frequency side.
机译：从理论上分析了腔长度比在谐振腔中循环的光的相干长度长的无源非线性光折射环形谐振器内部的调制不稳定性（MI）和图案形成的演变。还使用线性摄动理论对Kerr型非线性进行了数值分析，分析了低于阈值条件的系统动力学。低于腔阈值的时间上不相干的腔中的调制不稳定性过程以及各种参数（例如腔长度，微扰波场的强度反馈，入射光束的幅度和空间频率）对增益因子和空间的影响还研究了光谱密度。对于扰动波场，已经发现MI的增长率随着强度反馈以及空间频率的增加而增加。还已经发现，对于给定的空间频率值，增加扰动波场的强度反馈，非线性介质输出处的扰动的空间频谱密度随着峰值位置向较高位置的增大而增加。空间频率方面。

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