研究目的
Investigating the sensing characteristics of long period grating fabricated in SMF-28 fibers using femtosecond laser pulses for applications in temperature, refractive index, and strain sensing.
研究成果
The fabricated LPG demonstrates high sensitivity to temperature, refractive index, and strain, with potential applications in multi-parameter sensing and high-temperature environmental monitoring. The results provide a foundation for further research into LPG applications in harsh environments.
研究不足
The study focuses on the fabrication and sensing characteristics of LPGs in SMF-28 fibers without hydrogen loading, potentially limiting the applicability to other fiber types or conditions. The high temperature and harsh environment applications are promising but require further validation under extreme conditions.
1：Experimental Design and Method Selection:
The LPG was fabricated in standard SMF-28 fibers without hydrogen loading by point-by-point direct writing based on femtosecond laser pulses with 800 nm wavelength and 100 fs pulse width.
2：Sample Selection and Data Sources:
Standard communication fiber (Corning SMF-28) was used.
3：List of Experimental Equipment and Materials:
Femtosecond laser amplifier system (Spectra-Physics, Inc.), 3D axis nano-translation platform (Newport, Inc.), super continuum light source (NKT Photonics), optical spectrum analyzer (OSA, YOKOGAWA AQ6370B).
4：Experimental Procedures and Operational Workflow:
The laser pulse energy was attenuated and focused into the fiber core by a 100 × Oil microscope objective lens. The LPGs were fabricated with specific parameters and their transmission spectra were monitored.
5：Data Analysis Methods:
The sensing sensitivities to temperature, external refractive index (RI), and strain were systematically examined.
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