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We report the first cascading third-harmonic generation by light from an alexandrite laser in β-BaB2O4. Ultraviolet (UV) light was generated by mixing the fundamental laser light with the second-harmonic light. The calculated effective nonlinear constant for type I mixing is nearly three times larger than that for type II. Using type I mixing we demonstrated UV light generation in the wavelength region 244–259 nm with 24% mixing efficiency at maximum.
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Imai et al. (1989) studied this question.
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