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Opt Express. 2009 Jan 19;17(2):592-7.

Tuning and focusing THz pulses by shaping the pump laser beam profile in a nonlinear crystal.

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Centre de Physique Moléculaire Optique et Hertzienne (C. P. M. O. H), CNRS UMR 5798, Université de Bordeaux 1, 351 cours de la libération, 33405, Talence, France.


Spatially shaped femtosecond laser pulses are used to generate and to focus tunable terahertz (THz) pulses by Optical Rectification in a Zinc Telluride (ZnTe) crystal. It is shown analytically and experimentally that the focusing position and spectrum of the emitted THz pulse can be changed, in the intermediate field zone, by controlling the spatial shape of the near-infrared (NIR) femtosecond (fs) laser pump. In particular, if the pump consists of concentric circles, the emitted THz radiation is confined around the propagation axis, producing a THz pulse train, and focusing position and spectrum can be controlled by changing the number of circles and their diameter.

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