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The second harmonic of the 794 nm output of a GaAlAs diode laser is generated in a LiIO 3 crystal in an external ring enhancement cavity. The dependence of the second-harmonic power on the input power has been measured and compared with the theory. The second-harmonic power of 7.4 µ W at 397 nm has been obtained with an input fundamental power of 28 mW by using an 8-mm-long LiIO 3 crystal.
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Oh et al. (1994) studied this question.
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