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23 March 2005 THz generation by DFG from two seeded PPLN-OPGs
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A continuous and tunable operation from 1.6 to 4.5 THz has been demonstrated using a difference frequency generation (DFG) scheme by using the nonlinear optical crystal 4-dimethylamino-N-methyl-4-stilbazolium-tosylate (DAST) as the DFG crystal. The scheme was based on DFG between two seeded optical parametric generators. The THz bandwidth was 2.4 GHz. A high-resolution transmission spectrum of water vapor in air was used to demonstrate the utility of this source over the above THz spectral range.
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Rashid Alkuwari, Peter E. Powers, Joseph W. Haus, Koji Suizu, and Hiromasa Ito "THz generation by DFG from two seeded PPLN-OPGs", Proc. SPIE 5710, Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications IV, (23 March 2005);

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