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THz Generation by Optical Rectification and Competition with Other Nonlinear Processes |
| ZHAO Zhen-Yu;HAMEAU Sophie;TIGNON Jerome |
| Laboratoire Pierre Aigrain, Ecole Normale Superieure, 24 rue Lhomond, F-75005 Paris, France |
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| Cite this article: |
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ZHAO Zhen-Yu, HAMEAU Sophie, TIGNON Jerome 2008 Chin. Phys. Lett. 25 1868-1870 |
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Abstract 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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| Keywords:
75.75.+a
75.50.Cc
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Received: 04 February 2008
Published: 29 April 2008
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