High-power continuous-wave doubly resonant all-intracavity sum-frequency mixing deep blue laser at 447 nm

Abstract

In this paper, a high-power continuous-wave deep blue laser at 447 nm with intracavity tripling was achieved. The deep blue laser at 447 nm is obtained by using a doubly cavity, and type-II critical phase matching KTP crystal for intracavity sum-frequency mixing. Through designing of the cavity, the optimum matching of modes and gains for the two wavelengths was obtained. With incident pump power of 30 W for the Nd:YVO 4 crystal and 16 W for the other Nd:YVO 4 crystal, the deep blue laser output of 3.5 W at 447 nm with TEM 00 mode was obtained, the beam quality M 2 value was equal to 1.8 in both horizontal and vertical directions at the maximum output power, and the power stability is better than 3% at the maximum output power during half an hour. The experimental results show that the intracavity sum-frequency mixing by doubly resonant is an effective method for high-power blue laser.