Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/61159
Title: Negative-index gratings formed by femtosecond laser overexposure and thermal regeneration
Authors: He, J
Wang, Y
Liao, C
Wang, C
Liu, S
Yang, K
Wang, Y
Yuan, X
Wang, GP
Zhang, W
Issue Date: 2016
Publisher: Nature Publishing Group
Source: Scientific reports, 2016, v. 6, 23379 How to cite?
Journal: Scientific reports 
Abstract: We demonstrate a method for the preparation of negative-index fibre Bragg gratings (FBGs) using 800 nm femtosecond laser overexposure and thermal regeneration. A positive-index type I-IR FBG was first inscribed in H2-free single-mode fibre using a femtosecond laser directed through a phase mask, and then a highly polarization dependant phase-shifted FBG (P-PSFBG) was fabricated from the type I-IR FBG by overexposure to the femtosecond laser. Subsequently, the P-PSFBG was thermally annealed at 800 °C for 12 hours. Grating regeneration was observed during thermal annealing, and a negative-index FBG was finally obtained with a high reflectivity of 99.22%, an ultra-low insertion loss of 0.08 dB, a blueshift of 0.83 nm in the Bragg wavelength, and an operating temperature of up to 1000 °C for more than 10 hours. Further annealing tests showed that the thermal stability of the negative-index FBG was lower than that of a type II-IR FBG, but much higher than that of a type I-IR FBG. Moreover, the formation of such a negative-index grating may result from thermally regenerated type IIA photosensitivity.
URI: http://hdl.handle.net/10397/61159
EISSN: 2045-2322
DOI: 10.1038/srep23379
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