340 W Nd:YVO4Innoslab laser oscillator with direct pumping into the lasing level

We present a high power 340 W Nd:YVO4 Innoslab laser end-pumped by 880 nm laser-diode stacks. A maximum output power of 340 W was obtained at the absorbed power of 710 W with optical conversion efficiency up to 47.9 %. At the output power of 300 W, the M-2 factors in the unstable direction and the stable direction were 2.1 and 3.4, respectively.