It is reported that efficient continuous-wave (CW) green laser generation at 540 nm in a KTP crystal at type-II phase matching direction performed with a diode-pumped Nd:CaYAlO4 laser. With incident pump power of 18.2 W, output power of 324 mW at 540 nm has been obtained using a 5 mm-long KTP crystal. At the output power level of 324 mW, the output stability is better than 2.8%. The beam quality M 2 values were equal to 1.34 and 1.22 in X and Y directions, respectively.
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Fu et al. (2011) studied this question.
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