A Q-switched mode-locked (QML) laser at 2 μm waveband is demonstrated with with a maximum average power of watts. Graphene oxide are prepared by the vertical growth method and employed as a saturable absorber for passively QML operation. The stable QML pulses at 1897 nm are obtained with pulse width of 5.04 ns. The maximum output power of the laser is 1050 mW with a pump power of 20 W for an output coupler of 9%. The repetition frequency and width of QML pulses are 53.19 MHz and 5.04 ns, respectively. The modulation depth reach almost 100%. The Watt level QML all-solid-state Tm, Ho:LLF ceramic laser has broad application prospects in space target detection, environmental detection, and nonlinear optical research.
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Jiang et al. (2024) studied this question.
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