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A passively Q-switched mode-locked all-solid-state Tm:CaYAIO4 (Tm:CYA) laser with a MoS2 saturable absorber is demonstrated for the first time. Employing a typical X-type cavity and output coupling mirror of 9%, when the laser diode pump power is higher than 8.5 W, the laser enters into a stable Q-switched mode-locked operation, further increasing the pump power into a dual-wavelength operating state; the corresponding typical center wavelengths are 1,863 and 1,877 nm. When the pump power reaches 20 W, the maximum output power is 1.15 W, the frequency of mode-locked pulse is 103.7 MHz, and the modulation depth of mode-locked pulses in the Q envelope is close to 100%. The results prove that MoS2 saturable absorber is suitable for 2-μm high-power mode locking.

Watt-Level Dual-Wavelength Q-Switched Mode-Locked All-Solid-State Tm:CYA Laser