Preparation and characterization of highly thulium- and alumina-doped optical fibers for single-frequency fiber lasers

0374572 - ÚFE 2012 RIV US eng C - Conference Paper (international conference)
Honzátko, Pavel - Dhar, Anirban - Kašík, Ivan - Podrazký, Ondřej - Matějec, Vlastimil - Peterka, Pavel - Blanc, W. - Dussardier, B.
Preparation and characterization of highly thulium- and alumina-doped optical fibers for single-frequency fiber lasers.
Photonics, Devices, and Systems V (Proceedings of SPIE Vol. 8306). Bellingham: SPIE, 2011, s. 8306081-8306086. ISBN 978-0-8194-8953-1.
[Conference on Photonics, Devices, and Systems V. Praha (CZ), 24.08.2011-26.08.2011]
R&D Projects: GA ČR(CZ) GAP205/11/1840
Institutional research plan: CEZ:AV0Z20670512
Keywords : optical microresonator * thulium-doped fibers * single-frequency
Subject RIV: JB - Sensors, Measurment, Regulation

Thulium-doped fibers suitable for core-pumped single-frequency lasers were fabricated by the modified chemical vapor deposition (MCVD) method. Refractive index profile, doping profile and spectral absorption was measured. High doping concentration of thulium ions should be achieved to allow for high absorption of light at a pump wavelength while the thulium ions clustering should be avoided to prevent the cooperative upconversion and quenching processes. The fabricated fibers featured pump absorption up to 70dB/m at a pump wavelength of 1611nm. The single-frequency master oscillator with a resonator composed of a pair of fiber Bragg gratings and a thulium-doped fiber was demonstrated with predominantly single ended operation. We achieved a slope efficiency of 22/% and a threshold of 22mW at a lasing wavelength of 1944nm
Permanent Link: http://hdl.handle.net/11104/0207462