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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 2 — Jan. 28, 2013
  • pp: 2452–2462

Long-range parametric amplification of THz wave with absorption loss exceeding parametric gain

Tsong-Dong Wang, Yen-Chieh Huang, Ming-Yun Chuang, Yen-Hou Lin, Ching-Han Lee, Yen-Yin Lin, Fan-Yi Lin, and Galiya Kh. Kitaeva  »View Author Affiliations

Optics Express, Vol. 21, Issue 2, pp. 2452-2462 (2013)

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Optical parametric mixing is a popular scheme to generate an idler wave at THz frequencies, although the THz wave is often absorbing in the nonlinear optical material. It is widely suggested that the useful material length for co-directional parametric mixing with strong THz-wave absorption is comparable to the THz-wave absorption length in the material. Here we show that, even in the limit of the absorption loss exceeding parametric gain, the THz idler wave can grows monotonically from optical parametric amplification over a much longer distance in a nonlinear optical material until pump depletion. The coherent production of the non-absorbing signal wave can assist the growth of the highly absorbing idler wave. We also show that, for the case of an equal input pump and signal in difference frequency generation, the quick saturation of the THz idler wave predicted from a much simplified and yet popular plane-wave model fails when fast diffraction of the THz wave from the co-propagating optical mixing waves is considered.

© 2013 OSA

OCIS Codes
(190.4410) Nonlinear optics : Nonlinear optics, parametric processes
(190.4970) Nonlinear optics : Parametric oscillators and amplifiers

ToC Category:
Nonlinear Optics

Original Manuscript: November 28, 2012
Manuscript Accepted: January 14, 2013
Published: January 24, 2013

Tsong-Dong Wang, Yen-Chieh Huang, Ming-Yun Chuang, Yen-Hou Lin, Ching-Han Lee, Yen-Yin Lin, Fan-Yi Lin, and Galiya Kh. Kitaeva, "Long-range parametric amplification of THz wave with absorption loss exceeding parametric gain," Opt. Express 21, 2452-2462 (2013)

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