研究目的
To explore the fabrication mechanism and spectral characteristics of fiber gratings fabricated by point-by-point direct-writing based on femtosecond laser pulses.
研究成果
The study successfully fabricated various types of fiber gratings in standard telecommunication fiber without hydrogen loading using the point-by-point direct writing method based on femtosecond laser pulses. The research provides a powerful experimental gist and theoretical basis for the fabrication of different types of fiber gratings, exploring the mechanism of fiber grating fabrication by femtosecond laser direct writing technology.
研究不足
The limitations include the inevitable loss, the accuracy of optical path, and the scanning precision of the OSA in the experimental process.
1：Experimental Design and Method Selection:
The point-by-point direct writing fabrication method is used based on a femtosecond laser amplifier system with 100 fs pulse duration, 1 kHz repetition rate, and a central wavelength of 800 nm. The laser is focused into the fiber core by a 100X microscope objective.
2：Sample Selection and Data Sources:
Standard telecom fiber SMF-28 (Corning, Inc) is used without hydrogen loading. The transmission spectrum is measured by an optical spectrum analyzer (OSA) with a 0.05 nm resolution.
3：05 nm resolution.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Femtosecond laser amplifier system, high reflectance (HR) steer mirrors, 100X microscope objective, neutral density filters, half-wave plate, polarizer, double CCD camera for monitoring, super continuous light source (NKT Photonics), and OSA (YOKOGAWA AQ6370C).
4：Experimental Procedures and Operational Workflow:
The fiber is mounted on a three-dimensional motor-controlled translation stage. The laser pulse energy is adjusted to inscribe fiber gratings with different spectral characteristics by varying the grating period and structure.
5：Data Analysis Methods:
The transmission spectrum characteristics are analyzed to determine the fabrication mechanism and spectral properties of the fiber gratings.
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