Long period grating in a multimode cyclic transparent optical polymer fiber inscribed using a femtosecond laser Antreas Theodosiou, Rui Min, Arnaldo G. Leal-Junior, Andreas Ioannou, Anselmo Frizera, Maria Jose Pontes, Carlos Marques, and Kyriacos Kalli Abstract In this Letter, we report, to the best of our knowledge, the first inscription of long period gratings (LPGs) [...]

All fiber mode-locked thulium-doped fiber laser using a novel femtosecond-laser-inscribed 45°-plane-by-plane-tilted fiber grating Nithyanandan Kanagaraj, Antreas Theodosiou, Jan Aubrecht, Pavel Peterka, Michal Kamradek, Kyriacos Kalli, Ivan Kasik and Pavel Honzatko Abstract Using the novel 45°-plane-by-plane-tilted fiber grating inscribed by a femtosecond laser as an in-line fiber polarizer, we demonstrate an all-fiber passively mode-locked thulium-doped fiber laser. We characterize the grating for polarization-dependent loss, [...]

Characterisation of silicon fibre Bragg grating in near-infrared band for strain and temperature sensing A. Theodosiou, M. Fokine, T. Hawkins, J. Ballato, U.J. Gibson, K. Kalli Abstract Fibre Bragg grating inscription in the crystalline silicon (Si)-core fibre is described using visible light femtosecond laser pulses. The femtosecond pulses at 517 nm propagate through the transparent silica glass cladding and [...]

Femtosecond Laser Written Plane-by-Plane Bragg Grating Sensors in Bioresorbable Phosphate Optical Fibres Antreas Theodosiou, Diego Pugliese, Edoardo Ceci-Ginistrelli, Nadia G. Boetti, Davide Janner, Daniel Milanese, and Kyriacos Kalli Abstract We report on the realization of different types of optical sensors in a bioresorbable phosphate glass optical fibre using a femtosecond laser operating at 517 nm. [...]

Twist dependencies of strain and temperature sensitivities of perfluorinated graded-index polymer optical fiber Bragg gratings Yosuke Mizuno, Tianyi Ma, Ryo Ishikawa, Antreas Theodosiou, Kyriakos Kalli, Heeyoung Lee, Kentaro Nakamura Abstract