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Brillouin mirror with an inverted acoustic profile in the presence of strong acoustic dispersion
Journal of the Optical Society of America B ( IF 1.9 ) Pub Date : 2021-01-19 , DOI: 10.1364/josab.402499
Antonio Montes , Carlos Montes , Éric Picholle

While usually negligible in standard optical fibers, the group velocity dispersion of acoustic waves may in some cases play a significant role in the dynamics of stimulated Brillouin scattering (SBS) in propagation media with more complex structures, such as microstructured fibers. The usual three-wave coherent model of SBS can be adapted to take perturbative acoustic dispersion into account, but the slowly varying envelope approximation does not hold for stronger values of the acoustic dispersion, which call for a more sophisticated inertial model of SBS. A new regime of SBS mirrors with a spatially inverted acoustic profile is predicted in this limit. In the presence of strong acoustic dispersion, this regime exhibits a higher conversion efficiency than the usual mirror in the dispersionless case, as well as nonlinear self-stabilization of the phase of the acoustic wave when the pump is strongly depleted. Formal calculations allow the identification of regions of strong dynamic dispersion.

中文翻译:

在强烈声散的情况下具有反向声学轮廓的布里渊镜

尽管通常在标准光纤中可以忽略不计,但在某些情况下,声波的群速度色散可能在结构更复杂的传播介质(如微结构纤维)中的受激布里渊散射(SBS)的动力学中起重要作用。SBS的常规三波相干模型可以进行调整,以考虑扰动的声散,但缓慢变化的包络近似不能满足更强的声散值的需求,因此需要更复杂的SBS惯性模型。在此限制范围内,预计将出现一种具有空间倒置声学轮廓的SBS镜新方案。在存在强声散射的情况下,与无散射情况下的常规镜面相比,该方案具有更高的转换效率,以及在泵严重耗尽时声波相位的非线性自稳定。形式计算可以确定动态分布较强的区域。
更新日期:2021-02-02
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