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报道了高频CO2激光脉冲在无限截止单模光子晶体光纤上写入的长周期光纤光栅的高温快速退火特性。实验发现以大约600℃为转折点,在退火温度低于600℃时,退火后的光栅谐振峰在低于退火温度的高温环境中的温度响应和应变响应都不稳定,线性度和重复性都较差;而在退火温度高于600℃而低于700℃时,退火后的光栅谐振峰在低于退火温度的高温环境中的温度响应和应变响应都很稳定,线性度和重复性也很好。如果将光栅加热到更高温度时,光栅会被慢慢部分擦除掉。通过对CO2激光脉冲在光纤上写入光栅过程引入光纤轴向不均匀的应力在不同高温下释放效率和程度的分析,对该现象进行了解释。
The high-temperature rapid annealing of long-period fiber gratings written by high-frequency CO2 laser pulses on an infinite-stop single-mode photonic crystal fiber is reported. The experimental results show that at 600 ℃, when the annealing temperature is lower than 600 ℃, the temperature and strain response of the annealed grating resonance peak are not stable under the high temperature environment below the annealing temperature, and the linearity and repeatability are both more When the annealing temperature is higher than 600 ° C and lower than 700 ° C, the resonance peak of the grating after annealing is stable in temperature and strain at a temperature lower than the annealing temperature, and has good linearity and repeatability . If the grating is heated to a higher temperature, the grating will be partially erased slowly. This phenomenon is explained by the analysis of the release efficiency and extent of the stresses in the axial direction of the fiber introduced into the grating by the CO2 laser pulse.