Abstract
We review the linear and nonlinear optical properties of crystals transparent near and below 200 nm and suitable for up conversion of femtosecond Ti:sapphire laser sources, /spl beta/-BaB/sub 2/O/sub 4/, the crystal with the largest birefringence of all presently available materials, is investigated experimentally as a quadrupler by mixing the fundamental and the third harmonic both using a 1-kHz repetition rate Ti:sapphire regenerative amplifier and a 82-MHz mode-locked Ti:sapphire laser. Milliwatt average powers near 200 nm are achieved in both cases. The sub-200-fs pulses at the fourth harmonic are almost bandwidth limited. Sum-frequency generation as a method for upconversion of femtosecond pulses is experimentally studied by mixing the fourth harmonic generated down to 189 nm by the regenerative amplifier with a parametrically generated femtosecond pulse in the infrared. Pulse energies at the microjoule level are produced with LiB/sub 3/O/sub 5/ above 180 nm. Li/sub 2/B/sub 4/O/sub 7/ shows superior performance in the 170-180-nm range, and the shortest wavelength achieved with KB/sub 5/O/sub 8//spl middot/4H/sub 2/O is 166 nm.
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