We report for the first time a continuous-wave (CW) orange radiation at 598 nm by intracavity sum-frequency generation of 1341 nm Nd:GdVO4 laser and 1080 nm Nd:YAlO3 (Nd:YAP) laser. Orange laser is obtained by using a doubly cavity, type-II critical phase matching KTP crystal sum-frequency mixing. With total pump power of 36 W, TEM00 mode orange laser at 598 nm of 268 mW is obtained. The orange power stability in 30 min is better than 3.8%.
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