Femtosecond laser micromachining of Fabry-Perot cavity in fibre Bragg grating

Rodrigo Fiorin; Fernando N. Cidade; Jociel L. S. Adachi; Lucieli Rossi; Valmir de Oliveira; Ilda Abe; Hypolito J. Kalinowski

doi:10.1117/12.2195087

28 September 2015 Femtosecond laser micromachining of Fabry-Perot cavity in fibre Bragg grating

Rodrigo Fiorin, Fernando N. Cidade, Jociel L. S. Adachi, Lucieli Rossi, Valmir de Oliveira, Ilda Abe, Hypolito J. Kalinowski

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Proceedings Volume 9634, 24th International Conference on Optical Fibre Sensors; 963471 (2015) https://doi.org/10.1117/12.2195087
Event: International Conference on Optical Fibre Sensors (OFS24), 2015, Curitiba, Brazil

Abstract

A 10 μm (length) × 75 μm (depth) open channel is fabricated in fibre Bragg gratings (FBG) by femtosecond laser micromachining. The FBG Fabry-Perot (FP) cavity formed by this complex structure has a length of 4 mm; value estimated from interference spectrum for the air open channel. Reflection spectra of FBG FP cavity as a function of the temperature shows the cavity phase change. The sensor is thermally characterized by filling polymer in the channel and subsequent UV curing; the results show a period shift of approximately 12 x10^-3, value obtained of interferometer pattern for 30°C temperature range.

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Rodrigo Fiorin, Fernando N. Cidade, Jociel L. S. Adachi, Lucieli Rossi, Valmir de Oliveira, Ilda Abe, and Hypolito J. Kalinowski "Femtosecond laser micromachining of Fabry-Perot cavity in fibre Bragg grating", Proc. SPIE 9634, 24th International Conference on Optical Fibre Sensors, 963471 (28 September 2015); https://doi.org/10.1117/12.2195087

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