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We experimentally demonstrated the fabrication of asymmetric long-period fiber gratings (LPFGs) in thin core fiber by use of focused CO 2 laser beam. The proposed device exhibits a high extinction ratio of over 25 dB at the resonant wavelength and a narrowed 3-dB bandwidth of only 8.7 nm, which is nearly one order of magnitude smaller than that of LPFGs in conventional single-mode fibers. It also...
We reported a gas pressure sensor based on CO 2-laser-induced long-period fiber grating (LPFG) in an air-core photonic bandgap fiber (PBF). The LPFG was inscribed in an air-core PBF by the use of an improved CO 2 laser system with an ultraprecision 2-D scanning technique, which induced periodic collapses of air holes along the axis of the PBF. Such an LPFG could be used to develop a promising gas...
We experimentally demonstrated the fabrication of fiber Bragg gratings by using femtosecond laser point-by-point inscription. It is easy to create fiber Bragg gratings with different grating periods by changing the translation speed of the optical fiber. Firstly, laser pulse energy was optimized to improve the transmission spectra of fiber Bragg gratings. Then, a fiber Bragg grating was inscribed...
High quality FBGs have been fabricated in our lab using three types of femtosecond laser inscription techniques, i.e. Phase Mask method, Line-by-Line method and Point-by-Point method. It is found that Phase Mask method shows the best spectral quality and repeatability but the flexibility is poor; Line-by-Line method exhibits good flexibility where nearly all the grating parameters can be adjusted...
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