500 kHz A-O Q-switched Nd:YVO₄ laser pumped by dual-end wave-locked 878.6 nm laser diode

A dual-end-pumped acousto-optics Q-switched Nd:YVO4 laser pumped by a wave-locked 878.6 nm laser diode can stable work at a repetition of 500 kHz at 1 064 nm. At the repetition frequency of 100 kHz, an output power of 18.2 W at 1 064 nm for an absorbed pump power of 58 W,corresponding to an optical to optical efficiency of 31.3%,the pulse width was 15.2 ns. At the repetition frequency of 500 kHz, an output power of 26.1 W at 1 064 nm for an absorbed pump power of 58 W, corresponding to an optical to optical efficiency of 45%, the pulse width was 44.2 ns, the stable working range extended from 100 to 500 kHz, and the beam quality was significantly improved compared with the traditional mode, and the transfer efficiency was also improved. The experiment shows that taking advantage of direct pumping by wave-locked 878.6 nm laser diode is helpful to reduce the heat effect of crystals, improve beam quality and optical to optical efficiency, and get more narrow pulse width laser output, and it has excellent temperature in a certain range.