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We have developed a widely-tunable monochromatic THz source based on phase-matched difference-frequency generation (DFG) in a GaP crystal. By using a 20-mm-long GaP crystal the output wavelength was tuned in the range of 71.1–2830μm whereas the highest peak power was 15.6W. The advantage of using GaP over birefringent non-linear-optical crystals is obvious: crystal rotation is no longer required for...
We have efficiently generated a monochromatic terahertz wave continuously tunable in the ranges of 83.1-1642 μm and 80.2-1416 μm as a result of phase-matched difference-frequency generation in an annealed zinc-germanium phosphide crystal. The highest output peak power achieved by us is 134 W. Compared with our previous result, we have significantly improved the tuning ranges and peak powers by using...
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