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We report the first, according to our knowledge, experiment for direct third harmonic (TH) generation in periodically poled quadratic crystals. TH radiation of a diode array pumped and acousto-optically Q-switched Nd:YVO 4 laser is generated in a 25mm long periodically poled lithium niobate (PPLN) crystal of period 7.0μm. A theoretical model is developed that explains the experimental results...
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