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The authors present the result of efficiently producing the THz radiations by using collinear phase-matched difference-frequency generation (DFG) in a GaP crystal. The authors have extended the THz output wavelengths to as long as 2830 mum. In addition, the peak power has reached 15.6 W. Since GaP is a cubic crystal, there is no need to rotate this in order to tune the output wavelength in a wide...
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