Efficient bragg grating fabrication in Ge-rich fibre by high-intensity femtosecond 264 mm irradation

S.A. Slattery, D.N. Nikogasyan, Nikolai Plougmann, Henrik Rokkjær Sørensen, Martin Kristensen

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Abstract

Fibre Bragg gratings (FBGs) are usually fabricated by UV laser light (typically, 248 nm radiation from a KrF* excimer laser), which spectrally coincides with the absorption band of defects in germanosilicate fibre core [1, 2]. Recently, it was demonstrated that the use of highintensity femtosecond UV pulses leads to an improvement of the inscription efficiency in photosensitive fibres due to realisation of the two-step excitation process S0!S1!SN [3, 4]. The possibility of such an improvement follows from the consideration of the scheme of the electronic levels for the germanium sites in fused silica glass and corresponding defects [5]. In this Letter we study FBG recording in a highly-nonlinear fibre (HNLF, OFS Denmark), employing 264 nm femtosecond pulses with a peak intensity of around 180 GW=cm2. refractive fluence, kJ/cm2.
Original languageEnglish
JournalElectronics Letters
Volume40
Issue number23
Pages (from-to)1472-1473
ISSN0013-5194
Publication statusPublished - 2004

Cite this

Slattery, S. A., Nikogasyan, D. N., Plougmann, N., Sørensen, H. R., & Kristensen, M. (2004). Efficient bragg grating fabrication in Ge-rich fibre by high-intensity femtosecond 264 mm irradation. Electronics Letters, 40(23), 1472-1473.