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Random-Distributed Feedback Fiber Lasers Based on Rayleigh Scattering

机译：基于瑞利散射的随机分布反馈光纤激光器

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摘要

Single-mode optical fibers have been widely used in optical communications, and effective fiber lasers have been designed on the basis of active fibers with linear or ring cavities. In fiber lasers, the distance between the cavity mirrors can reach 270 km (the maximum length is determined by the linear attenuation and nonlinear dephasing of the waves). In 2009, random lasing was found in a long telecommunications fiber without any cavity: the positive distributed feedback required for lasing is due to Rayleigh scattering of light, and distributed amplification is provided by stimulated Raman scattering. Such a laser can be classified into the group of so-called random lasers, actively studied recently; the fiber geometry and the weakness of Rayleigh scattering provide much better output characteristics compared to the other types of random lasers. The lasing efficiency and beam quality of this laser are comparable to those of fiber lasers with a conventional cavity. At the same time, it has a number of unique features (unlimited length, and mode-free spectrum etc.), providing new physical phenomena and new opportunities for applications in telecommunications and sensor systems. The paper presents a review of recent results of studies in this area.
机译：单模光纤已被广泛用于光通信，并且已经基于具有线性或环形腔的有源光纤设计了有效的光纤激光器。在光纤激光器中，腔镜之间的距离可以达到270 km（最大长度由波的线性衰减和非线性移相确定）。 2009年，在没有任何空腔的长电信光纤中发现了随机激射：激射所需的正分布反馈是由于光线的瑞利散射，而受激拉曼散射则提供了分布放大。可以将这种激光器分类为最近被积极研究的所谓随机激光器。与其他类型的随机激光器相比，光纤的几何形状和瑞利散射的弱点提供了更好的输出特性。该激光器的激光发射效率和光束质量与具有常规腔的光纤激光器相当。同时，它具有许多独特的功能（无限的长度和无模频谱等），为电信和传感器系统中的应用提供了新的物理现象和新的机会。本文介绍了该领域的最新研究成果。

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