Abstract
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 LiB <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> O <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">5</sub> by frequency doubling of a diode-pumped electrooptic <i xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">Q</i> -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.
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