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Opt Lett. 2004 Sep 1;29(17):2046-8.

Cascaded nonlinear difference-frequency generation of enhanced terahertz wave production.

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Department of Biomedical Engineering, Tufts University, Medford, Massachusetts 02155, USA.


Cascaded nonlinear optical interactions are analyzed for their potential to overcome quantum-defect related limitations on the efficiency of terahertz wave difference-frequency generation. The dispersion of ZnTe permits phase-matched production of a series of Stokes lines from two initial near-infrared beams. As the pump beams run down the Stokes ladder, the number of terahertz photons continually increases. A potential improvement by a factor of 5 is demonstrated in a 0.26-cm-long crystal by use of 25-MW/mm2 pumps at a wavelength of 824 nm.

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