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A type II noncritically phase-matched LiB3O5 optical parametric generator pumped by a 30 ps 355 nm laser pulse is reported. 482.6 - 415.9 nm tunable wavelengths with linewidths as low as 0.15 nm, the highest pump-to-signal energy conversion efficiency up to 37.6%, and 6.33 mJ 211 MW peak-power single pulse have been achieved. Optical parametric process is a well-known way used to generate a high power tunable laser. The development of both the new nonlinear crystals such as (beta) -BaB2O4(BBO)1 and LiB3O5(LBO)2 and the high peak-power (GW) coherent sources have provided a good experimental situation.
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