Two novel high gain optical interactions using an Er:YLF laser operating at 1.73 µm have been demonstrated, parametric amplification of a 3.39 µm HeNe in AgGaSe2 and second harmonic generation in LiNbO3. While parametric amplification corresponded closely to model expectations, second harmonic generation did not, primarily because of poor crystal quality. A method of assessing crystal quality is vividly demonstrated.

© 1989 Optical Society of America

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