All-solid-state continuous-wave frequency-doubled Nd:YAG–BiBO laser with 28-W output power at 473 nm

We report on a diode-pumped Nd:YAG laser with 4.6 W of linear polarized continuous-wave (cw) output power on the ${{}^{4}F}_{3/2}\to {{}^{4}I}_{9/2}$ transitions at 946 nm. Three different crystals, cut for critical type I phase matching at room temperature, are used for the intracavity frequency doubling of the laser: 10-mm-long ${\mathrm{LiB}}_3{\mathrm{O}}_5$ (LBO), an 8-mm-long $\beta -{\mathrm{BaB}}_2{\mathrm{O}}_4$ (BBO), and a 10.4-mm-long ${\mathrm{BiB}}_3{\mathrm{O}}_6$ (BiBO) grown by FEE GmbH. Up to 2.8 W of cw output power in the blue spectral range at 473 nm has been achieved with the BiBO crystal (2.1 W with BBO and 1.5 W with LBO).