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17 October 2006 Tunable THz source based on frequency conversion in quasi-phase-matched GaAs
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Proceedings Volume 6386, Optical Methods in the Life Sciences; 63860T (2006)
Event: Optics East 2006, 2006, Boston, Massachusetts, United States
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.
© (2006) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
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, and C. Lynch "Tunable THz source based on frequency conversion in quasi-phase-matched GaAs", Proc. SPIE 6386, Optical Methods in the Life Sciences, 63860T (17 October 2006);

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