The retracing behavior of the phase‐matching angle (RBPA) in optical parametric generation (OPG) based on a LiB3O5(LBO) crystal and pumped at 532 nm by a frequency doubled, passive‐active mode‐locked Nd:YAG laser is investigated. Two pairs of radiations, which are simultaneously generated in the OPG, are observed and the spectral radiant power of the four tunable beams are obtained, showing good agreement with the theoretical calculation results. Together with the parametric process, two kinds of frequency‐mixing waves are produced and this novel multiwavelength interaction phenomenon is analyzed. ©1995 American Institute of Physics.