CC BY
9LS-I-15
Ultrashort pulses dynamics in 2 um spectral range lasers and
amplifiers
V.A. Kamynin, A.D. Zverev, S.A. Filatova, I.V. Zhluktova, N.R. Arutyunyan, E.D. Obraztsova, and V.B. Tsvetkov
Prokhorov General Physics Institute of the Russian Academy of Sciences, 38, Vavilov str., 38, 119991 Moscow,
Russia
Main author email address: kamyninva@gmail.com
All-fiber ultrashort pulses sources operating in the spectral range of 1900-2200 nm have numerous applications. Now, they are widely used in medicine, industry, and science [1, 2]. Ultrashort pulses in fiber lasers can be obtained in the passive mode-locking regime by using various artificial: nonlinear polarization evolution [3], nonlinear optical loop mirror [4], or real: SESAM semiconductor mirrors [5], films based on carbon nanotubes [6] of graphene [7], and topological insulators [8] saturable absorbers.
Fiber lasers operating in the 2 um spectral range are often based on optical fibers doped with thulium, holmium, or thulium - holmium complexes. A broad luminescence spectrum of thulium and holmium ions allows one to obtain ultrashort pulses generation. Particularly, in thulium fiber lasers, pulses with durations from hundreds of femtoseconds to several picoseconds were realized [9-11]. Close pulses durations were obtained in holmium fiber lasers [12, 13]. Despite numerous works, investigation of influence cavity topologies, and saturable absorbers configuration on the mode-locking regimes is still in great demand.
In our work, we studied generation regimes of thulium and holmium fiber lasers with ring and dumbbell-shaped cavities. Mode-locking operation mode was realized by the implementation of a different number of SWCNT films into the cavity. Not only fundamental mode-locking with repetition rates from 5 to 20 MHz but pulse-burst with intrapulse interval less than 10 ns and harmonic mode-locking with repetition rates up to 110 MHz regimes were observed at the laser output. Then ultrashort pulse radiation from the master oscillators was amplified. We have investigated the time and spectral dynamics of different ultrashort pulses modes during the amplification by holmium- and thulium-doped fiber amplifiers.
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