  High energy terahertz pulses are produced by optical rectification (OR) in
organic crystals DAST and DSTMS by a Ti:sapphire amplifier system centered at
0.8 microns. The simple scheme provides broadband spectra between 1 and 5 THz,
when pumped by collimated 60 fs near-infrared pump pulse and it is scalable in
energy. Fluence-dependent conversion efficiency and damage threshold are
reported as well as optimized OR at visible wavelength.
