Generation of 85-fs pulses at 13 μm for ultrabroadband pump-probe spectroscopy

We report on a near-infrared non-collinear optical parametric amplifier (NOPA) based on periodically poled stoichiometric lithium tantalate. The NOPA generates mu J-energy pulses with spectrum spanning the 1-1.7 mu m wavelength range, which are compressed to nearly transform-limited 8.5 fs duration by a deformable mirror. By synchronizing this source with a sub-10-fs visible NOPA, we demonstrate an unprecedented combination of temporal resolution and spectral coverage in two-colour pump-probe spectroscopy. (C) 2009 Optical Society of Americ