Penghao Zhang, Hongbo Wu, Shuang Chen, Wensong Jiang, Li Zhang. Fabrication of Low-Loss Femtosecond Fiber Bragg Gratings Based on Beam Shaping by Small Aperture[J]. Chinese Journal of Lasers, 2024, 51(2): 0206003
- Chinese Journal of Lasers
- Vol. 51, Issue 2, 0206003 (2024)
Fig. 1. Schematic of point-by-point fabrication of FBG based on beam shaping by small aperture
Fig. 2. Waist radius and Rayleigh length versus aperture of diaphragm
Fig. 3. Focal field energy distributions. (a) Aperture of 10.0 mm; (b) aperture of 1.0 mm
Fig. 4. Test method for FBG transmission spectrum. (a) Test of light source transmission spectrum; (b) pretest of FBG transmission spectrum
Fig. 5. Microscopic images of FBG fabricated with different apertures and corresponding transmission spectra
Fig. 6. Insertion loss and short-wavelength loss values of FBG fabricated with different apertures
Fig. 7. Schematics of cladding mode coupling. (a) Circular grating fringe; (b) filamentous grating fringe
Fig. 8. FBG transmission spectra in air and matching liquid
Fig. 9. FBG transmission spectra oscillating at short wavelength side. (a) FBG prepared on coated fiber; (b) low reflection
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