Gain-controlled broadband tuneability in self-mode-locked Thulium-doped fibre laser

0561096 - ÚFE 2023 RIV DE eng J - Článek v odborném periodiku
Kirsch, D.C. - Bednyakova, A. - Vařák, Petr - Honzátko, Pavel - Cadier, B. - Robin, T. - Fotiadi, A. - Peterka, Pavel - Chernysheva, M.
Gain-controlled broadband tuneability in self-mode-locked Thulium-doped fibre laser.
COMMUNICATIONS PHYSICS. Roč. 5, č. 1 (2022), č. článku 219. ISSN 2399-3650. E-ISSN 2399-3650
Institucionální podpora: RVO:67985882
Klíčová slova: Fibers * Thulium-doped fibers * Laser excitation
Obor OECD: Optics (including laser optics and quantum optics)
Impakt faktor: 5.5, rok: 2022
Způsob publikování: Open access
https://doi.org/10.1038/s42005-022-00989-x

Ensuring self-driven mode-locking and broadband wavelength tuneability in all-fibre-integrated femtosecond laser sources enables a new level of their versatility and extends areas of their applications. Principle limitations for this are traditionally available ultrafast modulators and tuneability techniques. Here, we exploit Thulium-doped fibre to perform three roles in the cavity: laser gain, saturable absorber, and tuneability element via controlling its excitation level. We confirmed that Tm-doped fibre saturable absorption is defined by a reinforced quenching of Tm3+ pairs. As a result, we present both numerically and experimentally a highly stable sub-picosecond pulse generation with a similar to 90 nm tuneability range spanning from 1873 to 1962 nm via adjusting the cavity feedback. The maximum laser efficiency corresponds to 25% cavity feedback, enabling the highest output energy of 1 nJ in 600-fs solitons at 1877 nm. Overall, the presented laser system establishes a compact and straightforward approach for ultrafast generation, which can be translated to other fibre laser operation wavelengths.
Trvalý link: https://hdl.handle.net/11104/0338907