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Highly efficient parametric frequency conversion of light in large-aperture crystals grown by a fast method, S A Akhmanov, I A Begishev, A A Gulamov, E A Erofeev, B V Zhdanov, V I Kuznetsov, Leonid N Rashkovich, T Usmanov
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Akhmanov et al. (1984) studied this question.
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