Zhang Zhe, Xu Baijie, He Jun, Hou Maoxiang, Bao Weijia, Wang Yiping
Guangdong and Hong Kong Joint Research Centre for Optical Fiber Sensors, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China.
Guangdong Laboratory of Artificial Intelligence and Digital Economy (SZ), Shenzhen University, Shenzhen 518060, China.
Sensors (Basel). 2020 Aug 1;20(15):4307. doi: 10.3390/s20154307.
A high-energy nanosecond-pulsed ultraviolet (UV) laser Talbot interferometer for high-efficiency, mass production of fiber Bragg grating (FBG) array was experimentally demonstrated. High-quality FBG arrays were successfully inscribed in both H-free and H-loaded standard single-mode fibers (SMFs) with high inscription efficiency and excellent reproducibility. Compared with the femtosecond pulse that had a coherent length of several tens of micrometers, a longer coherent length (~10 mm) of the employed laser rendered a wider FBG wavelength versatility over 700 nm band (1200-1900 nm) without the need for optical path difference (OPD) compensation. Dense FBG array with center wavelength separation of ~0.4 nm was achieved and more than 1750 FBGs with separated center wavelength could be inscribed in a single H-free or H-loaded SMF in theory, which is promising for mass production of FBG arrays in industry. Moreover, precise focusing of laser beam was superfluous for the proposed system due to the high energy density of pulse. The proposed FBG inscription system was promising for industrialization production of dense FBG arrays.
实验展示了一种用于高效批量生产光纤布拉格光栅（FBG）阵列的高能纳秒脉冲紫外（UV）激光塔尔博特干涉仪。高质量的FBG阵列成功写入无氢和含氢标准单模光纤（SMF）中，写入效率高且重复性好。与相干长度为几十微米的飞秒脉冲相比，所采用激光的较长相干长度（约10毫米）使得在700纳米波段（1200 - 1900纳米）具有更宽的FBG波长通用性，无需光程差（OPD）补偿。实现了中心波长间隔约为0.4纳米的密集FBG阵列，理论上在单根无氢或含氢SMF中可写入超过1750个中心波长分离的FBG，这对于工业上FBG阵列的批量生产很有前景。此外，由于脉冲的高能量密度，所提出的系统无需激光束的精确聚焦。所提出的FBG写入系统对于密集FBG阵列的工业化生产很有前景。
