A. S. Vakhrushev, A. V. Kharakhordin, A. M. Khegai, S. V. Alyshev, K. E. Riumkin, E. G. Firstova, A. A. Umnikov, A. S. Lobanov, F. V. Afanas’ev, A. N. Gur’yanov, M. A. Mel’kumov, S. V. Firstov
a Fiber Optics Research Center of the Russian Academy of Sciences, Moscow
b Institute of Chemistry of High-Purity Substances RAS, Nizhnii Novgorod
Abstract: A bismuth-doped fibre laser operating in the spectral region 1.3 – 1.4 μm and pumped into the cladding of an active fibre by multimode semiconductor diodes at a wavelength of 0.79 μm has been fabricated for the first time. Experimental data are presented on the operation regimes of various configurations of the laser, obtained by changing the reflection coefficients and spectral selectivity of the mirrors, as well as the length of the active fibre. The slope efficiency of the bismuth-doped laser at a wavelength of 1360 nm is 1.4% with respect to the pump power launched into the fibre cladding, and the maximum output power exceeds 300 mW.
Keywords: bismuth, bismuth active centres, optical fibre, fibre laser
Received: 20.05.2022