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应用飞秒激光直写技术刻写了熊猫型双折射光纤布拉格光栅(PF-FBG)。飞秒激光直写技术是将激光焦点聚集到光纤纤芯位置,曝光过程中匀速移动光纤,最终得到周期性的折射率调制区域。PF-FBG具有双折射特性,在波长为1550nm附近可以得到具有双峰的反射谱结构,因此可用于多传感参数的监控。研究了PF-FBG的温度和轴向应力的传感特性。PF-FBG兼具飞秒激光诱导光栅结构的高温稳定性,在苛刻环境下化学、物理传感方面具有潜在的应用价值。
The panda-type birefringent fiber Bragg grating (PF-FBG) was inscribed using femtosecond laser direct writing technology. Femtosecond laser direct writing technology focuses the laser focus on the fiber core position, and moves the optical fiber uniformly during the exposure process to finally obtain the periodic refractive index modulation region. The PF-FBG has birefringence characteristics, and a bimodal reflection spectrum structure can be obtained at a wavelength of about 1550 nm. Therefore, the PF-FBG can be used for monitoring the multi-sensor parameters. The sensing characteristics of temperature and axial stress of PF-FBG were studied. PF-FBG possesses the high temperature stability of the femtosecond laser-induced grating structure and has potential applications in chemical and physical sensing under harsh environment.