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Proceedings Paper

Tunable THz source based on frequency conversion in quasi-phase-matched GaAs
Author(s): K. L. Vodopyanov; J. Schaar; M. M. Fejer; X. Yu; J. S. Harris; Y.-S. Lee; V. G. Kozlov; G. Imeshev; M. E. Fermann; D. Bliss; C. Lynch
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Paper Abstract

We report a new highly efficient source of frequency-tunable (0.5-3.5 THz) narrow-bandwidth terahertz wave packets with up to 1 mW average power, based on parametric down-conversion in quasi-phase-matched GaAs. Different lasers were employed as a pump source, including femtosecond OPA/DFG system (wavelength range 2-4μm), Tm-fiber femtosecond laser (wavelength ~2μm), and near-degenerate synchronously-pumped picosecond OPO system with extra- and intracavity THz generation. We prove experimentally that the optical-to-terahertz conversion efficiency is fluence-dependent, with the scaling factor being the same for femtosecond (optical rectification) and picosecond (difference frequency generation) pump pulses, with optical-to-terahertz conversion efficiency on the order of 0.1% per μJ.

Paper Details

Date Published: 17 October 2006
PDF: 13 pages
Proc. SPIE 6386, Optical Methods in the Life Sciences, 63860T (17 October 2006); doi: 10.1117/12.692053
Show Author Affiliations
K. L. Vodopyanov, Stanford Univ. (United States)
J. Schaar, Stanford Univ. (United States)
M. M. Fejer, Stanford Univ. (United States)
X. Yu, Stanford Univ. (United States)
J. S. Harris, Stanford Univ. (United States)
Y.-S. Lee, Oregon State Univ. (United States)
V. G. Kozlov, Microtech Instruments, Inc. (United States)
G. Imeshev, IMRA America, Inc. (United States)
M. E. Fermann, IMRA America, Inc. (United States)
D. Bliss, Hanscom Air Force Research Lab. (United States)
C. Lynch, Hanscom Air Force Research Lab. (United States)


Published in SPIE Proceedings Vol. 6386:
Optical Methods in the Life Sciences
Alexey A. Belyanin; Mostafa Analoui; Rebekah Anna Drezek; Claire F. Gmachl, Editor(s)

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