研究目的
Investigating a phase mask inscription technique for creating chirped fiber Bragg gratings with nonhomogeneous periods using two-beam interferometry and analyzing its dependence on the coherence properties of the inscription laser.
研究成果
The chirped phase mask interferometer is suitable for inscribing chirped fiber Bragg gratings with good wavelength versatility, especially when the coherence properties of the applied laser system are considered. The technique shows potential for applications such as resonator mirrors for fiber laser setups and special filters for biophotonic applications.
研究不足
The study is limited by the coherence properties of the inscription laser, which affect the maximum effective length of the chirped fiber Bragg gratings and their reflection bandwidth.
1：Experimental Design and Method Selection:
The study employs a phase mask inscription technique with two-beam interferometry using a lateral nonhomogeneous beam splitter.
2：Sample Selection and Data Sources:
Inscription experiments are conducted with deep ultraviolet excimer and femtosecond laser sources on hydrogen-loaded commercial single-mode fibers.
3：List of Experimental Equipment and Materials:
Includes a phase mask fabricated in-house, Mantis-Legend Elite-Tripler femtosecond laser, and Compex 150 T KrF excimer laser.
4：Experimental Procedures and Operational Workflow:
The method involves creating gratings with nonhomogeneous periods and analyzing their reflection bandwidth and group delay.
5：Data Analysis Methods:
The study uses theoretical predictions and experimental measurements to analyze the spectral width and dispersion of the gratings.
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