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Article Dans Une Revue Chinese Physics Letters Année : 2008

THz generation by optical rectification and competition with other nonlinear processes

Jérôme Tignon

Résumé

We present a study of the competition between tera-hertz (THz) generation by optical rectification in <110> ZnTe crystals, two-photon absorption, second harmonic generation and free-carrier absorption. The two-photon nonlinear absorption coefficient, second harmonic generation efficiency and free-carrier absorption coefficient in the THz range are measured independently. The incident pump field is shown to be depleted by two-photon absorption and the THz radiation is shown to be reduced, upon focusing, by free-carrier absorption. The reduction of the generated THz radiation upon tight focusing is explained, provided that one also takes into account diffraction effects from the sub-wavelength THz source.
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Dates et versions

hal-00270129 , version 1 (03-04-2008)

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  • HAL Id : hal-00270129 , version 1

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Zhen-Yu Zhao, Sophie Hameau, Jérôme Tignon. THz generation by optical rectification and competition with other nonlinear processes. Chinese Physics Letters, 2008, 25 (5), pp.1868. ⟨hal-00270129⟩
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