Diode-end-pumped solid state ZnWO4 Raman laser at 2254 nm

A diode-end-pumped actively Q-switch intracavity Raman laser with a Tm:YLF laser gain medium and a ZnWO4 Raman gain crystal is demonstrated for the first time. Under the pump power of 30 W at 793?nm, the average output power of 184 mW at first Stokes wavelength of 2254?nm was obtained at a pulse repetition of 2.5?kHz. The corresponding pulse width and output peak power are 5.8 ns and 12.79 kW, respectively. Near-diffraction limited beam quality was observed (M-2????1.46).