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This paper described the 3D simulation method and results of electron gun and beam transport for the 0.14THz TWT with the help of CST. The hot test results show that the design of the electron beam optics system satisfied the need of the TWT. It bases the manufacture of the 0.14THz travelling wave tube.
As a wide bandgap and single crystalline semiconductor, 4H-polytype silicon carbide (4H-SiC) is an excellent material choice for devices operating in harsh environments of high temperature, high pressure, radiation, chemical and biomedical, etc. In this letter, an electrostatically actuated 4H-SiC microresonator was fabricated by dopant-selective photoelectrochemical etching of n-p-n homoepitaxial...
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.
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 observed broadband quasi-phase-matched backward difference-frequency generation in short-period periodically-poled KTP, which can be used as a novel scheme for spectral phase conjugation.
By coupling two counter-propagating fundamental beams into a LiNbO3 channel waveguide, we have generated a strong surface-emitting second-harmonic beam, with normalized conversion efficiency being enhanced by seven orders of magnitude.
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.
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...
Upconversion of laser beam at 10.26 mum to 1.187 mum was achieved in a GaSe crystal via difference-frequency generation with the highest conversion efficiency measured to be 19%. Saturation due to pump depletion was evidenced.
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