Abstract
Lithium triborate (LBO) is a newly discovered nonlinear crystal with features of high damage threshold, nonhygroscopic, wide angle bandwidth and may be noncritically phase-matched. In this paper we report the experimental and calculated results for frequency doubling of the tunable solid-state lasers of Ti:sapphire and Cr:LiSrAIf (LISAF) using LBO crystals angle cut 32.6 (in xy plane) and at 36 were used to cover the angle tuning ranges. In the case of Ti:sapphire laser, we have achieved 2.8% efficiency for the generation of 396 nm, where the fundamental beam at 792 nm, 30 ns, 90 mJ was focused by a 15-cm lens. We have measured the phase matching curves for 750-810 nm which agree very well with our calculated values. For the LISAF laser (0.8-0.96 μm), we achieved 20% doubling efficiency at an input energy of 30 mJ (pulse width of 50μs). The angular and spectral bandwidths of LBO were measured. Phase-matching angles for doubling 800-960 nm were measured and matched very well with the calculated values.
© 1990 Optical Society of America
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