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The paper puts forward a design thought of phase velocity tapering in the design of 140GHz folded waveguide traveling wave tubes. It can make electron with traveling wave field synchronization again in output segment of interaction circuit. By the phase velocity analysis and optimized design, the big signal simulation is calculated in operating voltage 14.05kV and current 25mA. The efficiency is improved...
MgO-doped periodically-poled LiNbO3 waveguide is used to up-convert photons at 1.535–1.568 μm to those at 598–603 nm, which can be detected by avalanche photodetector at single-photon counting level. Conversion efficiencies up to 45% are achieved.
By stacking two GaP plates, we have improved the THz peak power from 433 W to 1.36 kW based on difference-frequency generation, corresponding to an enhancement by two orders of magnitude over the previous result.
The average terahertz output power generated from stacked GaAs wafers using two CO2 lasers is scaled up by 160. The highest average output power is measured to be 29.8 muW by stacking ten wafers.
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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