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This letter reports the generation of 6.1 W of red laser radiation by frequency-doubling a Nd:YAG laser operating at a wavelength of 1.319 /spl mu/m with a KTP crystal. The conversion efficiency and the stability of the red output power were both improved through the suppression by means of a thin etalon of two-wavelength operation in the 1.3-/spl mu/m region.
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Inoue et al. (1999) studied this question.
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