研究目的
Characterisation of silicon fibre Bragg grating in near-infrared band for strain and temperature sensing.
研究成果
The strain and thermal responses of the first FBG in Si-core fibres written by stressing the Si-fibre core, using a visible femtosecond laser were demonstrated. The strain sensitivity of the Si grating was found to be ～4 times less than for silica fibres, whereas the temperature sensitivity was ～7.6 times higher.
研究不足
The strain sensitivity of the Si grating was found to be ～4 times less than for silica fibres, whereas the temperature sensitivity was ～7.6 times higher. Some differences may be expected due to the thermal expansion of the cladding (silica) glass being six times less than for Si.
1：Experimental Design and Method Selection:
The inscription setup consisted of a femtosecond laser operating at a wavelength of 517 nm producing pulses of 220 fs duration, a long working distance lens, and an air-bearing translation stage for high-precision movement.
2：Sample Selection and Data Sources:
The Si fibre sample had a 12 μm core diameter and a glass cladding with a total diameter of 125 μm.
3：List of Experimental Equipment and Materials:
Femtosecond laser (femtoREGEN HighQ), long working distance lens (Mitutoyo)×50, air-bearing translation stage, broadband light source (Thorlabs ASE730), commercial Bragg spectrometer (IBSEN IMON HS).
4：Experimental Procedures and Operational Workflow:
The laser beam was swept transversely across the core at a velocity of 50 μm/s, resulting in a mean exposure of 100 pulses/μm. The fibre was displaced by a controlled step to define a periodic modulation along the fibre length.
5：Data Analysis Methods:
The reflection spectrum of the grating was recovered using a commercial Bragg spectrometer.
独家科研数据包，助您复现前沿成果，加速创新突破
获取完整内容
