Both second harmonic and sum-frequency generations by using 1.5 μm diode lasers in a type II phase matched potassium titanyl phosphate are demonstrated for the first time. A maximum second harmonic output power of 1.0 μW is obtained with the use of an external builtup cavity, and a 0.23 μW sum-frequency output power at 0.54 μm is obtained by using 1.5 and 0.82 μm diode lasers.
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Wang et al. (1992) studied this question.
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