Open AccessTuning and focusing THz pulses by shaping the pump laser beam profile in a nonlinear crystal
Author(s) -
C. D’Amico,
Marc Tondusson,
Jérôme Degert,
É. Freysz
Publication year - 2009
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.17.000592
Subject(s) - optical rectification , optics , terahertz radiation , femtosecond , laser , materials science , pulse shaping , femtosecond pulse shaping , optoelectronics , nonlinear optics , physics
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.