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Terahertz output peak power as high as 2.7 kW is achieved by difference-frequency generation. Conversion efficiency reaching maximum value of 40% is obtained by reversely stacking four GaP plates.
We have demonstrated that frequency upconversion in periodically-poled LiNbO3 is capable of reaching single-photon sensitivities for detections at 1.27 μm and 1.57 μm at room temperature.
We have demonstrated recovery of polaritonic stop-band in pressed polycrystalline CaF2 powder. Due to small sizes of CaF2 particles, we have observed evidence of severe damping of polaritonic waves at particle surfaces.
We have efficiently generated coherent mid-infrared pulses at 3.42 mum by mixing a CO2 laser beam with its second-harmonic output beam in a CdSe crystal with the output peak power as high as 39.2 W.
Frequency mixing in nonlinear crystals corresponds to one of the efficient schemes for generating coherent THz pulses from intense laser beams. Recently, difference-frequency-generation (DFG) using coherent pulses at 1 mum was investigated in a few nonlinear materials; the highest peak power generated so far is 390 W. However, the average output power was still limited to 20 muW. In order to further...
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