Guan Bai-Ou, Ran Yang, Feng Fu-Rong, Jin Long
Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications, Institute of Photonics Technology, Jinan University, Guangzhou 510632, China.
Sensors (Basel). 2017 Feb 18;17(2):398. doi: 10.3390/s17020398.
Being one of the most proven fiber optic devices, the fiber Bragg grating has developed continually to extend its applications, particularly in extreme environments. Accompanying the growth of Type-IIa Bragg gratings in some active fibers, a new resonance appears at the shorter wavelength. This new type of grating was named "secondary Bragg grating" (SBG). This paper describes the formation and applications of the SBGs. The formation of the SBG is attributed to the intracore Talbot-type-fringes as a result of multi-order diffractions of the inscribing beams. The SBG presents a variety of interesting characteristics, including dip merge, high-temperature resistance, distinct temperature response, and the strong higher-order harmonic reflection. These features enable its promising applications in fiber lasers and fiber sensing technology.
作为最成熟的光纤器件之一，光纤布拉格光栅不断发展以拓展其应用，特别是在极端环境中。随着某些有源光纤中II - a型布拉格光栅的发展，在较短波长处出现了一种新的共振。这种新型光栅被命名为“二次布拉格光栅”（SBG）。本文描述了二次布拉格光栅的形成及应用。二次布拉格光栅的形成归因于写入光束的多阶衍射所产生的芯内塔尔博特型条纹。二次布拉格光栅呈现出多种有趣的特性，包括凹陷合并、耐高温、独特的温度响应以及强烈的高阶谐波反射。这些特性使其在光纤激光器和光纤传感技术中具有广阔的应用前景。
