High Temperature Sustainable Tilted Fiber Bragg Gratings Via Femtosecond Laser Plane-By-Plane Writing Technology

In this paper, high-quality tilted fiber Bragg gratings (TFBGs) inscribed by using femtosecond laser and the slit beam shaping technique were reported. By adjusting the included angle between the slit and the fiber, we realized a series of tilted gratings with tilt angles of 0° (FBG), 5°, 10°, 15°,...

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Bibliographic Details
Published in:Journal of lightwave technology 2023-07, Vol.41 (13), p.1-6
Main Authors: Li, Xingyong, Bao, Weijia, Chen, Fengyi, Yang, Aoao, Wang, Ruohui, Qiao, Xueguang
Format: Article
Language:English
Subjects:
Bragg gratings
Claddings
Fiber lasers
Gratings
High temperature
Insertion loss
Laser beams
Laser modes
Lasers
Plane-by-Plane
Refractive index
Refractivity
Resonance
Slit beam shaping technology
TFBGs
Ultrafast optics
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Summary:In this paper, high-quality tilted fiber Bragg gratings (TFBGs) inscribed by using femtosecond laser and the slit beam shaping technique were reported. By adjusting the included angle between the slit and the fiber, we realized a series of tilted gratings with tilt angles of 0° (FBG), 5°, 10°, 15°, and 20° in a single-mode-fiber. For a 10° TFBG, the Bragg resonance was -1.90 dB at 1604.51 nm, and the maximum cladding-mode resonance reached 36.17 dB with an insertion loss of 1.44 dB due to the method of Plane-by-Plane (Pl-by-Pl) inscription. The effects of slit widths and different laser pulse energies on the Pl-by-Pl writing of TFBGs were also studied. The refractive index response sensitivity of the 10° TFBG was measured at 449.45 nm/RIU. Moreover, the TFBG written by this method was a type-II grating, which could withstand a high temperature of 1100 °C for a long time.
ISSN:0733-8724
1558-2213
DOI:10.1109/JLT.2022.3218853