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Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  • Editor: Henry Van Driel
  • Vol. 26, Iss. 9 — Sep. 1, 2009
  • pp: A101–A106

Enhancement of terahertz wave generation by cascaded χ ( 2 ) processes in Li Nb O 3

Mukesh Jewariya, Masaya Nagai, and Koichiro Tanaka  »View Author Affiliations


JOSA B, Vol. 26, Issue 9, pp. A101-A106 (2009)
http://dx.doi.org/10.1364/JOSAB.26.00A101


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Abstract

We demonstrate, to the best of our knowledge, a novel generation process of a terahertz (THz) electromagnetic wave via a noncollinear χ ( 2 ) process in Li Nb O 3 with a phase-front-controlled femtosecond Ti:sapphire laser pulse. Systematic measurements of both the THz electric field and the excitation transmitted through an Li Nb O 3 crystal at different excitation powers show that the maximum amplitude of the THz electric field increases nonlinearly above the critical input powers. This enhancement of optical rectification efficiency is attributed to the distortion of the excitation pulse shape via electro-optic (EO) phase modulation by the emitted THz wave. Actually, spectral line shapes of both the THz wave and the excitation pulse become broadened above the threshold, and they are well reproduced by numerical simulations with equivalent one-dimensionally mapped coupled equations in the frequency domain. This generation scheme shows potential optimization of further generation efficiency.

© 2009 Optical Society of America

OCIS Codes
(190.4410) Nonlinear optics : Nonlinear optics, parametric processes
(040.2235) Detectors : Far infrared or terahertz

History
Original Manuscript: February 4, 2009
Revised Manuscript: May 21, 2009
Manuscript Accepted: June 5, 2009
Published: July 20, 2009

Citation
Mukesh Jewariya, Masaya Nagai, and Koichiro Tanaka, "Enhancement of terahertz wave generation by cascaded χ(2) processes in LiNbO3," J. Opt. Soc. Am. B 26, A101-A106 (2009)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-26-9-A101


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