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Intracavity doubling in β-BaB2 O4 (BBO) of femtosecond pulses into the ultraviolet with high efficiency is reported. Pulse widths down to 43 fs at a 108 Hz repetition rate and outputs as high as 20 mW per arm of the femtosecond laser on a continuous-wave basis can be achieved. The ultraviolet pulse widths were determined through detailed cross-correlation measurements based on sum-frequency mixing to 210 nm in ultrathin BBO crystals.
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Edelstein et al. (1988) studied this question.
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