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Proceedings Paper

Investigation of limits on peak powers and conversion efficiencies for quasi-single-cycle THz pulses based on phase-matched difference-frequency generation: review
Author(s): Yujie J. Ding
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Paper Abstract

We have reviewed our most recent results. Let us consider a second-order nonlinear medium in which perfect phase-matching can be achieved at one particular output wavelength for the process of the THz generation from a train of ultrafast laser pulses based on difference-frequency generation. We assume that the coherence lengths for the THz generation are sufficiently long within a wide bandwidth around this perfect phase-matching wavelength due to a slight dispersion in the THz region (i.e. broadband phase-matching). In this theoretical work, we show that quasi-single-cycle THz pulses can be efficiently generated. An efficient conversion for the THz generation is made possible not only by utilizing the broadband phase-matching but also by optimizing the pulse width for each peak THz frequency. We have investigated the regime of the strong pump depletion and found the limits to the conversion efficiencies. We have ruled out the significant contributions due to the effects of multiphoton absorption, free-carrier absorption, and nonlinear refractive indices.

Paper Details

Date Published: 25 March 2005
PDF: 12 pages
Proc. SPIE 5727, Terahertz and Gigahertz Electronics and Photonics IV, (25 March 2005); doi: 10.1117/12.584857
Show Author Affiliations
Yujie J. Ding, Lehigh Univ. (United States)

Published in SPIE Proceedings Vol. 5727:
Terahertz and Gigahertz Electronics and Photonics IV
R. Jennifer Hwu; Kurt J. Linden, Editor(s)

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