A　blue　light　420-485　nm　output　with　a　linewidth　of　0.3　nm　and　a　purnp-to-signal　energy　conversion　efficiency　of　up　to　29%　at　an　injected　seeding　energy　of　400　mu　J　has　been　achieved.　The　optimum　crystal　length　from　4　to　2　mm　at　a　pump　intensity　of　500　MW/cm(2)　is　studied　using　computer　simulation.　The　experimental　designs　of　the　optical　parametric　generation　of　type-II　noncritical-phase-matched　LiB3O5　and　the　amplification　of　type-I　critical-phase-matched　beta-BaB2O4　are　presented　in　detail.　The　experimental　setup　is　pumped　using　the　355　nm　30　ps-duration　output　pulse　of　an　active-passive　model-locked　Nd:　YAG　laser,　is　reported.