Preforms of the Bragg fiber in the form of tubes were prepared by the MCVD method. Germanium dioxide and phosphorous pentoxide were used as silica dopants for the high-index layers. The low-index layers were fabricated of silica slightly doped with phosphorous pentoxide. The last layer applied was the high-index one. Bragg fibers were drawn from the tubes under controlled temperatures around 2000 °C in order to obtain the fibers with designed dimensions of Bragg claddings and air cores. Results of characterization of prepared fibers with optical microscopy are presented in the paper. The transmittance and attenuation of the fibers at 632 nm were measured with a continuous-wave He-Ne laser as a light source. Spatial distributions of output beams from the fibers were also determined.
ACCESS THE FULL ARTICLE
Vlastimil Matějec, Ondřej Podrazký, Ivan Kašík, Milan Frank, Michal Jelínek, Václav Kubeček, "Transmission of red-laser radiation by using Bragg fibers with air cores," Proc. SPIE 9507, Micro-structured and Specialty Optical Fibres IV, 95070Q (7 May 2015);