Abstract
We demonstrate optical parametric generation and amplification of femtosecond pulses in the entire visible range using type-I phase-matched β-barium borate and lithium triborate crystals pumped by the frequency-doubled output of a Ti:sapphire regenerative amplifier at 395 nm. The output is tunable from 470 to 770 nm with a pulse width of ∼170 fs at a repetition rate of 1 kHz and a maximum output energy of ∼1.1 µJ/pulse. The visible optical parametric amplifier output was then frequency doubled and sum frequency mixed with the fundamental output of Ti:sapphire at 790 nm to produce UV pulses with a conversion efficiency of greater than 25%. The second harmonic generated UV pulses are tunable from 240 to 380 nm with a maximum pulse energy of ∼260 nJ/pulse.
© 1997 Optical Society of America
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