Single-pass second-harmonic generation of 7W continuous wave of 542nm radiation with 35.4% efficiency was achieved by quasiphase matching in periodically poled Mg-doped stoichiometric lithium tantalate at room temperature. The effects of laser beam quality and linewidth on the second-harmonic generation efficiency were investigated using a Yb-doped fiber laser.
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Tovstonog et al. (2007) studied this question.
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