Femtosecond-laser-induced highly birefringent Bragg gratings in standard optical fiber
Femtosecond-laser-induced highly birefringent Bragg gratings in standard optical fiber
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DOI：
10.1364/ol.38.000594
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发表时间：
2013-02-15
期刊：
影响因子：
3.6
通讯作者：
Caucheteur, Christophe
中科院分区：
文献类型：
--
作者：
Chah, Karima;Kinet, Damien;Caucheteur, Christophe
我们报告了通过紫外飞秒脉冲和逐行刻录实现的标准单模光纤中的高双折射光纤布拉格光栅。通过控制聚焦激光束相对于纤芯的三维定位，我们在单次曝光中在光栅位置实现了非常高的双折射。当使用2μJ脉冲时，10阶光栅的最大双折射值已达到7.93 x 10(-4)，据我们所知，这是迄今为止报道的最高双折射值。这种双折射是由紫外线引起的高密度线从纤芯中心偏移造成的，从而增加了引起应力线的不对称性。由于偏振模式之间的布拉格波长间隔达到 800 pm 以上，此类光栅特别适合选择性滤波，或者如此处所示，适用于对温度不敏感的横向应变测量。 (C) 2013 美国光学学会
We report highly birefringent fiber Bragg gratings in standard single-mode optical fiber realized with UV femto-second pulses and line-by-line inscription. By controlling the three-dimensional positioning of the focused laser beam with respect to the fiber core, we achieve very high birefringence at the grating location in a single exposure. A maximum birefringence value of 7.93 x 10(-4) has been reached for 10th-order gratings when using 2 mu J pulses, which is to our knowledge the highest birefringence value reported so far. This birefringence results from UV-induced high-densification lines shifted from the center of the core, increasing the asymmetry of the induced-stress lines. With a Bragg wavelength spacing reaching more than 800 pm between polarization modes, such gratings are particularly well suited for selective filtering or, as demonstrated here, for temperature-insensitive transverse-strain measurements. (C) 2013 Optical Society of America