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Optics Express

Optics Express

  • Editor: Michael Duncan
  • Vol. 14, Iss. 12 — Jun. 12, 2006
  • pp: 5476–5483

Direct evidence of Kerr-like nonlinearity by femtosecond Z-scan technique

Wei-Qiang He, Chun-Ming Gu, and Wen-Zhong Shen  »View Author Affiliations


Optics Express, Vol. 14, Issue 12, pp. 5476-5483 (2006)
http://dx.doi.org/10.1364/OE.14.005476


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Abstract

Kerr-like nonlinearity n2THz induced via terahertz (THz) radiation and linear electro-optic (EO) effect is investigated in (110), (111) and (100) oriented ZnTe crystals using Z-scan technique with femtosecond laser pulses. We have proposed a model, taking into account the Kerr-like nonlinearity n2THz, to describe well the experimental incident polarization dependence of the nonlinear refractive index n2. It is found that for a (110) ZnTe crystal the nonlinear refractive index n2 is dominated by the Kerr-like nonlinearity n2THz, while n2 in the (111) ZnTe crystal mainly comes from the combined contributions of the Kerr-like nonlinearity n2THz and conventional Kerr nonlinearity n2Kerr. We also show strong two-photon absorption (TPA) anisotropy and crystal orientation dependence of TPA in ZnTe crystals.

© 2006 Optical Society of America

OCIS Codes
(160.2100) Materials : Electro-optical materials
(190.3270) Nonlinear optics : Kerr effect
(320.2250) Ultrafast optics : Femtosecond phenomena

ToC Category:
Nonlinear Optics

History
Original Manuscript: February 21, 2006
Revised Manuscript: May 19, 2006
Manuscript Accepted: May 22, 2006
Published: June 12, 2006

Citation
Wei-Qiang He, Chun-Ming Gu, and Wen-Zhong Shen, "Direct evidence of Kerr-like nonlinearity by femtosecond Z-scan technique," Opt. Express 14, 5476-5483 (2006)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-14-12-5476


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