Forward Brillouin scattering in few-mode fibers

IF 20.6 Q1 OPTICS
Elad Layosh, Elad Zehavi, Alon Bernstein, Mirit Hen, Maayan Holsblat, Ori Pearl, Avi Zadok
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Abstract

Forward Brillouin scattering is an opto-mechanical effect in which two co-propagating optical fields couple with an acoustic mode in a common medium. The effect has been studied in standard optical fibers since 1985, however nearly all studies have been limited to the single optical mode regime. Forward Brillouin scattering in single-mode fibers takes place through two classes of acoustic modes only: purely radial ones and modes of two-fold azimuthal symmetry. Acoustic modes may only be stimulated at their cut-off frequencies, and the acoustic frequencies in standard fibers are limited to 600 MHz. In this work, we extend the study of forward Brillouin scattering to few-mode optical fibers through analysis, calculations, and experiment. Measurements are performed in a commercial, off-the-shelf step-index fiber with standard cladding through three optical modes. We demonstrate for the first time the stimulation of acoustic modes with first-order and fourth-order azimuthal symmetries. Acoustic frequencies up to 1.8 GHz are observed, and the acoustic modes are stimulated above their cut-off frequencies. Angular momentum is transferred between the orbital degrees of freedom of the optical and acoustic waves. The results extend the understanding and formulation of forward Brillouin scattering in optical fibers, and they may find applications in fiber lasers, sensing, non-reciprocal propagation effects, and quantum states manipulation.

Abstract Image

低模光纤中的正向布里渊散射
前向布里渊散射是一种在共同介质中两个共传播光场与声模式耦合的光力学效应。自1985年以来,人们已经在标准光纤中研究了这种效应,但几乎所有的研究都局限于单光模式。单模光纤中的正向布里渊散射仅通过两类声学模式发生:纯径向模式和双重方位角对称模式。声波模式只能在其截止频率处被激发,标准光纤中的声波频率被限制在600mhz。在这项工作中,我们通过分析,计算和实验将前向布里渊散射的研究扩展到少模光纤。测量是在一个商用的,现成的阶梯折射率光纤与标准包层通过三种光学模式。我们首次证明了具有一阶和四阶方位角对称性的声模的刺激。声学频率高达1.8 GHz,声学模式在其截止频率以上被激发。角动量在光波和声波的轨道自由度之间传递。这些结果扩展了对光纤中正向布里渊散射的理解和表述,并可能在光纤激光器、传感、非互易传播效应和量子态操纵中得到应用。
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来源期刊
Light-Science & Applications
Light-Science & Applications 数理科学, 物理学I, 光学, 凝聚态物性 II :电子结构、电学、磁学和光学性质, 无机非金属材料, 无机非金属类光电信息与功能材料, 工程与材料, 信息科学, 光学和光电子学, 光学和光电子材料, 非线性光学与量子光学
自引率
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发文量
803
审稿时长
2.1 months
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