Xinran Dong, Zheng Xie, Yuxin Song, Kai Yin, Dongkai Chu, Ji’an Duan. High temperature-sensitivity sensor based on long period fiber grating inscribed with femtosecond laser transversal-scanning method[J]. Chinese Optics Letters, 2017, 15(9): 090602
- Chinese Optics Letters
- Vol. 15, Issue 9, 090602 (2017)
Fig. 1. Schematic diagram of femtosecond laser fabrication system.
Fig. 2. Schematic diagram of the paths of the femtosecond laser point-by-point method and the transversal-scanning method.
Fig. 3. SEM images of the fiber cross section inscribed with different methods: (a) point-by-point method, (b) transversal-scanning method.
Fig. 4. Transmission spectra of LPFGs fabricated by two different methods (LPFG-I with transversal-scanning method and LPFG-II with point-by-point method).
Fig. 5. (Color online) (a) Transmission spectra of LPFG-II with temperature increases; (b) resonant wavelength and attenuation change as a function of temperature change.
Fig. 6. (Color online) (a) Transmission spectra of LPFG-I with temperature increases; (b) resonant wavelength and peak attenuation change as a function of temperature change.
Fig. 7. (Color online) Changes of Δ
Fig. 8. (Color online) Transmission spectra of (a) LPFG-II and (b) LPFG-I before heating at 20°C and cooling down to 20°C, respectively.
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