High Stability Industrial-Grade Nd: YVO4 Picosecond Laser Amplifier With High Average Output Power

We demonstrate a high-power Nd: YVO 4 picosecond laser amplifier that is capable of generating 51.5 W average output power at wavelength 1,064 nm, with repetition rate 70 MHz and pulse duration 8.5 ps. This system encompasses three stages diode end-pumped amplification including two double-pass amplifiers single-pass amplifier. Laser near-diffraction-limited beam quality ( M 2 < 1.1) was maintained throughout the entire scaling range laser. The exhibited very high stability root-mean-square amplitude fluctuation less than 0.2% over period 15 h continuous operation.