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Abstract
Mode-locked laser operation near 2.05 µm based on a mixed sesquioxide ${\rm{Tm}}{:}{\rm{LuY}}{{\rm{O}}_3}$ ceramic is demonstrated. Continuous-wave and wavelength-tunable operation is also investigated. Employing a GaSb-based semiconductor saturable absorber mirror as a saturable absorber, a maximum average output power of 133 mW is obtained for a pulse duration of 59 fs. Pulses as short as 54 fs, i.e., eight optical cycles are generated at a repetition rate of ${\sim}{{78}}\;{\rm{MHz}}$ with an average output power of 51 mW. To the best of our knowledge, this result represents the shortest pulse duration ever achieved from Tm-based solid-state mode-locked lasers.
© 2020 Optical Society of America
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