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The intracavity second harmonic generation of YAlG/Nd laser using KNbO 3 single crystal was demonstrated and it was compared with that using Ba 2 NaNb 5 O 15 crystal. KNbO 3 was found to be suitable for this application because of (1) its large conversion efficiency, i.e. ( d 2 / n 3 ) KNbO 3 =0.8±0.1( d 2 / n 3 ) Ba 2 NaNb 5 O 15 , (2) its resistance to damage by intense green light output, and (3) its very low optical loss coefficients at the fundamental and the harmonic wavelengths (about 0.25%/cm at 1.06 µm). About 90% conversion of the optical second harmonics was obtained The thermal conductivity of KNbO 3 was found to be larger than that of Ba 2 NaNb 5 O 15 due to the increasing crystal temperature caused by the internal laser power.
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Uematsu et al. (1973) studied this question.
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