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Frequency doubling of a focused Gaussian beam involves phase mismatching due to beam divergence. The conversion efficiency was calculated by integration second-harmonic (SH) field along the energy flow propagation path. The resulting SH field spatial distribution was discussed. We demonstrated the generation of blue light in critically type-I phase-matched LiB3O5 by frequency doubling of a diode-pumped electrooptic Q -switched Nd:GSAG laser at room temperature. Pulsed blue light with 8-mJ energy and 300-ns pulse duration at 471 nm was generated with 19-mJ incident radiation at 10 Hz. The maximum conversion efficiency was 42%. The experimental results agree well with our calculations.