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High-efficiency generation of the third harmonic of 1.55 µm light is observed in a periodically poled MgO-doped LiNbO 3 disk resonator. The second harmonic is simultaneously generated. The blue-green emission arises from cascaded parametric processes of second-harmonic and sum-frequency generation by whispering gallery modes. An external conversion efficiency of 1.5%/W 2 is obtained.
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Sasagawa et al. (2009) studied this question.
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