Characteristic of high temperature structural long period grating fabricated by femtosecond laser

• 作 者: ShujingLiu[1]MingyanLuo[2]QiangJi[2]
• 机 构: School of Biomedical Engineering,Tianjin Medical University,Tianjin,300070,China
• 出 处: 第九届全国光子学学术会议暨中国光学学会纤维光学与集成光学专委会成立30周年大会
• 发表日期: 2014年期

　　Structural Long period gratings (LPGs) in photonic crystal fiber (PCF) were successfully fabricated using the femtosecond laser micromachining system by introducing periodic side-holes.High temperature characterizations of the fabricated gratings have been performed.The gratings written with the femtosecond laser micromachining technique suffer a low shift of the resonance wavelengths with sensitivity of 23pm/℃ while the temperature is increased from 20℃ to 1200℃.The LPGs have been found to have negligible temperature sensitivity whilst exhibiting useful strain (-1.86pm/με) and strong directional bend sensitivity bending sensitivities with -4.40nm·m (180°) and -2.79nm·m (0°) at low temperature.The unique sensing characteristics enable many potential sensing applications in high temperature environments.such as space aircraft,nuclear power plants,and the chemical industry.