Monoszlai, B.Vicario, C.Jazbinsek, M.Hauri, C. P.2014-01-092014-01-092014-01-09201310.1364/Ol.38.005106https://infoscience.epfl.ch/handle/20.500.14299/99235WOS:000327815100046High-energy terahertz pulses are produced by optical rectification (OR) in organic crystals 4-dimethylamino-N-methyl-4-stilbazolium tosylate (DAST) and 4-N,N-dimethylamino-4'-N'-methyl-stilbazolium 2,4,6-trimethylbenzenesulfonate (DSTMS) by a Ti: sapphire amplifier system with 0.8 mu m 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. (C) 2013 Optical Society of Americatext::journal::journal article::research article