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Abstract
We demonstrate sub-100-fs Kerr-lens mode-locking of a ${\rm{Tm}}\!:\!{\rm{MgW}}{{\rm{O}}_4}$ laser emitting at ${\sim}{{2}}\;\unicode{x00B5}{\rm m}$ assisted by a single-walled carbon-nanotube saturable absorber. A maximum average output power of 100 mW is achieved with pulse duration of 89 fs at a pulse repetition rate of ${\sim}{{86}}\;{\rm{MHz}}$. The shortest pulse duration derived from frequency-resolved optical gating amounts to 76 fs at 2037 nm, corresponding to nearly bandwidth-limited pulses. To the best of our knowledge, these are the shortest pulses generated from any Tm-doped tungstate crystal and the first report on saturable absorber assisted Kerr-lens mode-locking of a Tm laser at ${\sim}{{2}}\;\unicode{x00B5}{\rm m}$.
© 2020 Optical Society of America
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