High-energy terahertz pulses are produced by optical rectification (OR) in organic crystals 4-dimethylamino--methyl-4-stilbazolium tosylate (DAST) and 4-, -dimethylamino---methyl-stilbazolium 2,4,6-trimethylbenzenesulfonate (DSTMS) by a Ti:sapphire amplifier system with 0.8 μm central wavelength. The simple scheme provides broadband spectra between 1 and 5 THz, when pumped by a collimated 60 fs near-IR pump pulse, and it is scalable in energy. Fluence-dependent conversion efficiency and damage threshold are reported, as well as optimized OR at visible wavelengths.
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