A new method to get 413.7‐nm violet coherent radiation by using second‐harmonic generation and sum‐frequency mixing of radiation from a 1341.4‐ and 1079.5‐nm dual‐wavelength Nd:YALO3laser in a LiIO3crystal is reported in this communication. First, the 670.7‐nm red coherent radiation is obtained by second‐harmonic generation of 1341.4‐nm radiations in a LiIO3crystal, and then the 670.7‐ and 1079.5‐nm radiations are mixed again in a second LiIO3crystal to get 413.7‐nm radiation. The phase‐matching angles are obtained for both nonlinear optical processes. The experimental results agree well with calculated results.