A series of IR stimulated and c scade stimulated radiation (ws) were detected when the 7S state of potassium was populsted by two-photon resonance excitation. Nine UV coherent radiation lines (wP) were generated through the two-photon resonant four-wave mixing wP=2wL-ws. By the second four-wave mixing process wc = wP-w s ws", a gereies of UV and violet coherent radiation were formed. The schemes for generating IR stimul ted and UV, violet coherent radiation were discussed in this paper.