The energy level diagram and absorption spectrum of TmYAP crystal are analyzed, and TmYAP laser dual-end-pumped by laser diode is presented. The wavelength of laser is 1996 nm, the output power of 2 μm continuous wave laser is 40.7 W, the corresponding optical-to-optical efficiency is up to 30.4%, and the slope efficiency is 41.1%. While the acoustic-optical (AO) Q-switch is working at the repetition rate of 10 kHz, the average power is 34.6 W, the single pulse width is 92.08 ns, the corresponding optical-to-optical efficiency is 25.9%, and the slope efficiency is 32.9%. The divergence angles are 11.6 mrad (horizontal) and 12.2 mrad (vertical), respectively.