Effect of Tm3+ ion doping on the possibility of Bragg resonator inscription using an excimer laser

In this study, a comprehensive analysis of the lanthanide doping effect on the possibility of producing Bragg resonators using a UV excimer laser is presented. To fabricate the optical fibre preform, modified chemical vapour deposition (MCVD) technology equipped with a doping system using organometallic lanthanide compounds produced by Optocore was used. The efficiency of the fibre Bragg grating (FBG) inscription process was examined. Inscription of gratings was performed using manufactured fibre subjected and not subjected to hydrogen loading. The changes in three parameters characterizing the FBG spectra during exposure to the UV laser beam were determined. The efficiency of grating inscription on the produced lanthanide-doped fibres was compared to those on SMF-28 and NUFERN GF1 fibres. Since the spectral response is a key parameter determining the possibility of using FBGs for fibre laser construction, the temperature sensitivity for FBGs inscribed in the considered fibres was determined.

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The research leading to these results has received funding from the commissioned task entitled “VIA CARPATIA Universities of Technology Network named after the President of the Republic of Poland Lech Kaczyński”, contract no. MEiN/2022/DPI/2575 action entitled “In the Neighbourhood - Inter-university Research Internships and Study Visits”.