We obtained nearly transform-limited light pulses of 34 fs near 1.2 µm by pumping an optical parametric oscillator with a 2-mm-long KTP crystal by 26-fs pulses from a Ti:sapphire laser. The average power of the pulses that were obtained was greater than 50 mW, at an 80-MHz repetition rate. Attempts to downscale the pulse duration by decreasing the pump-pulse duration revealed remarkable limitations of the attainable pulse length for sub-30-fs pump pulses, in accordance with a recent theoretical study [J. Opt. Soc. Am. B <b>17,</b> 741 (2000)].
© 2000 Optical Society of America
(140.7090) Lasers and laser optics : Ultrafast lasers
(190.4970) Nonlinear optics : Parametric oscillators and amplifiers
(320.2250) Ultrafast optics : Femtosecond phenomena
(320.7110) Ultrafast optics : Ultrafast nonlinear optics
J. Hebling, X. P. Zhang, H. Giessen, J. Kuhl, and J. Seres, "Pulse characteristics of an optical parametric oscillator pumped by sub-30-fs light pulses," Opt. Lett. 25, 1055-1057 (2000)