Abstract

Kerr-lens mode-locked solid-state laser operation at ${\sim}\;{{2}}\;\unicode{x00B5}{\rm m}$ is investigated. Using a ${{\rm{Tm}}^{3 +}}$-doped ${({\rm{Lu}},{\rm{Sc}})_2}{{\rm{O}}_3}$ “mixed” sesquioxide ceramic as a gain medium, pulses as short as 58 fs are generated at ${\sim}{{2081}}\;{\rm{nm}}$ via soft-aperture Kerr-lens mode locking. The average output power amounts to 220 mW at a pulse repetition rate of 84.8 MHz. The emitted spectrum at the long-wavelength wing extends to ${\gt}\;{2.2}\;\unicode{x00B5}{\rm m}$ which is attributed to vibronic transitions of the ${\rm{T}}{{\rm{m}}^{3 +}}$ ions. The latter is found to be essential for generating pulses with durations in the 50 fs range.

© 2021 Optical Society of America

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Data underlying the results presented in this paper are not publicly available at this time but may be obtained from the authors upon reasonable request.

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