1 承德石油高等专科学校 河北省仪器仪表工程技术研究中心, 河北 承德 067000
2 河北地质大学 光电技术研究所, 石家庄 050700
光纤光栅压力传感器中光栅与金属基片的连接方法主要分为胶装工艺与金属化封装工艺, 工艺不同传感器会出现蠕变等现象, 也会直接影响传感器的测量精度。对自主设计的悬臂梁式光纤光栅压力传感器进行实验结果显示, 采用金属化封装工艺和353ND胶封装工艺制作的光纤光栅压力传感器其压力与波长的线性拟合度均高于0.998, 使用353ND胶与钢质金属基片胶装的光纤光栅压力传感器在0~6 MPa压力范围内, 在5 min内由于悬臂梁弯曲所造成的最大波长偏移为8 pm; 研究还表明, 同一结构金属化光纤光栅压力传感器其灵敏度是使用353ND胶制成的裸光纤光栅传感器的3.4倍。
光纤光栅传感器 蠕变 胶装工艺 金属化封装 fiber Bragg grating sensor creep adhesive technology metallized packaging
Author Affiliations
Abstract
1 Institute of Laser & Opto-electronics, College of Precision Instruments and Opto-Electronic Engineering, Tianjin University, Tianjin 300072, China
2 Laboratory Center for Precision Instrument & Opto-Electronics Engineering, Tianjin University, Tianjin 300072, China
3 Hebei Key Laboratory of Optoelectronic Information and Geo-detection Technology, Shijiazhuang University of Economics, Shijiazhuang 050031, China
4 College of Physical Science, Qingdao University, Qingdao 266071, China
An effective mode selection is important for the multi-core photonic crystal fiber (PCF) to obtain good output. Talbot cavity is popular to lock the in-phase mode, but few satisfactory experimental results have been reported. In this paper, a dual-Talbot cavity with reflected mirrors on each side of PCF is designed to lock the in-phase mode. The design gains the advantage of in-phase mode against out-of-phase mode. What’s more, it can weaken the influence brought by the imperfect end facet of the fiber. The corresponding theoretical analyses and the experiment are taken. The experimental results suggest that the dual-Talbot cavity improves the capacity of mode selection.
光电子快报（英文版）
2014, 10(1): 59
Author Affiliations
Abstract
1 Key Laboratory on Optoelectronics Information and Technical Science, Ministry of Education of China, Institute of Laser & Optoelectronics, College of Precision Instruments and Optoelectronic Engineering, Tianjin University, Tianjin 300072, China
2 Hebei Key Laboratory of Optoelectronic Information and Geo-detection Technology, Shijiazhuang University of Economics, Shijiazhuang 050031, China
A model based on propagation rate equations is built up for analyzing the multicore transverse mode gain distribution in an 18-core photonic crystal fiber (PCF) laser. The two kinds of feedback cavities are used for the fiber laser, which are the buttcontact mirror and the Talbot cavity. According to the model, the transverse mode competitions in different feedback cavities are simulated numerically. The results show that the Talbot cavity can improve in-phase supermode gain, while suppress other supermodes.
光电子快报（英文版）
2012, 8(6): 426
Author Affiliations
Abstract
1 Key Laboratory of Optoelectronics Information and Technical Science, Ministry of Education, Institute of Laser & Optoelectronics,College of Precision Instruments and Optoelectronic Engineering, Tianjin University, Tianjin 300072, China
2 Hebei Key Laboratory of Optoelectronic Information and Geo-detection Technology, Shijiazhuang University of Economics, Shijiazhuang 050031, China
3 Key Laboratory of Optoelectronics Information and Technical Science, Ministry of Education, Institute of Laser & Optoelectronics,ollege of Precision Instruments and Optoelectronic Engineering, Tianjin University, Tianjin 300072, China
4 College of Information, Hebei United University, Tangshan 063009, China
The thermal properties of photonic crystal fiber (PCF) laser with 18 circularly distributed cores are investigated by using full-vector finite element method (FEM). The results show that the 18-core PCF has a more effective thermal dispersion construction compared with the single core PCF and 19-core PCF. In addition, the temperature distribution of 18-core PCF laser with different thermal loads is simulated. The results show that the core temperature approaches the fiber drawing value of 1800 K approximately when the thermal load is above 80 W/m which corresponds to the pumping power of 600 W approximately, while the coating temperature approaches the damage value of about 550 K when the thermal load is above 15 W/m which corresponds to the pumping power of 110 W approximately. Therefore the fiber cooling is necessary to achieve power scaling. Compared with other different cooling systems, the copper cooling scheme is found to be an effective method to reduce the thermal effects.
