Fig. 8-3

Frequency conversion scheme using two nonlinear crystals with their optic axes arranged to be orthogonal Two nonlinear optical crystals are arranged with their optic axes orthogonal to one another. The converted output from the first crystal passes through the second crystal without interaction, and the unconverted laser beam in the first crystal will be converted in the second. This process can be repeated with the help of a half-wave plate, a quarter-wave plate, and two mirrors for the fundamental laser, resulting in a high total efficiency.

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