Efficient generation of subpicosecond terahertz radiation by phase-matched optical rectification using ultrashort laser pulses with tilted pulse fronts

Stepanov, Andrei G.; Hebling, János; Kuhl, Jürgen
October 2003
Applied Physics Letters;10/13/2003, Vol. 83 Issue 15, p3000
Academic Journal
We report on the generation of subpicosecond terahertz (THz) electromagnetic radiation in a nonlinear crystal by ultrashort laser pulses with a tilted pulse front. Free-space THz pulses with an energy of 98 pJ and a repetition rate of 200 kHz have been obtained by optical rectification using 2.3 μJ near-infrared laser pulses in a LiNbO[sub 3] crystal cooled down to 77 K. The emitted THz beam has a divergence smaller than 40 mrad, which is close to the diffraction limit. Spectral analysis of the generated THz beam with a Michelson interferometer reveals an approximately 1.5 THz broad asymmetric peak centered at 2 THz and a pulse duration of less than 500 fs. © 2003 American Institute of Physics.


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