Watt-level passively Q-switched mode-locked Tm,Ho:LLF laser at 1882 nm

Employing double wall carbon nanotube (DWCNT) grown by vertical growth method as saturable absorbe（SA）r, and we realize a watt-level Q-switched mode-locking operation in an all-solid-state Tm,Ho:LiLuF4 (Tm,Ho:LLF) laser with high power. When the pump power is greater than 7.76 W, the laser operation enters a stable Q-switched mode-locking state. When the pump power is increased to 20 W, the maximum output power is 1480 mW under 9% output coupled mirror. In this case, the central wavelength is 1882 nm and the repetition frequency is 55.55MHz, corresponding a maximum single pulse energy of 2.88 nJ, and modulation depth in Q-switching envelopes is close to 100%.

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