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报道了一种利用飞秒激光微纳加工技术在非敏化单模光纤中制备的高阶倾斜光纤Bragg光栅(HOTFBG)。倾斜折射率调制是将聚焦的飞秒激光穿过高阶相位掩模板,并扫描曝光倾斜放置的光纤实现的,其覆盖了全部纤芯和部分包层。该单一HO-TFBG在1200~1700nm波长范围内可形成三组与高阶Bragg谐振相对应的“包层模式谐振系列”。因此,其携带的信息量远高于紫外倾斜光纤Bragg光栅(UV-TFBG),其功能性更佳,尤其适用于多传感参数的监控。研究了HO-TFBG的折射率、轴向应变和温度等传感特性。此外,该器件兼具飞秒激光诱导光栅结构的高温稳定性,其在苛刻环境中的化学和物理传感具有潜力。
A high-order oblique fiber Bragg grating (HOTFBG) fabricated in a non-sensitized single-mode fiber using femtosecond laser micro-nano processing technology is reported. Tilt index modulation is achieved by passing a focused femtosecond laser through a high-order phase mask and scanning the exposed, obliquely placed fiber, covering the entire core and partial cladding. The single HO-TFBG forms three “cladding-mode resonant series” corresponding to higher-order Bragg resonances in the 1200-1700 nm wavelength range. Therefore, the amount of information it carries is much higher than that of UV-TFBG, which is more functional and is especially suitable for the monitoring of multi-sensor parameters. The sensing properties of HO-TFBG such as refractive index, axial strain and temperature were studied. In addition, the device combines the high temperature stability of a femtosecond laser induced grating structure with potential for chemical and physical sensing in harsh environments.