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A W-band reflective gyrotron backward wave oscillator (Gyro-BWO) is fabricated to systematically study the physics of competition between backward wave and forward wave. Two cavities, namely a single cavity and complex cavity, will be tested. Theoretical investigation indicates that the competition in a complex cavity is much improved and is capable of generating much stronger efficient radiation.
A Ka-band gyrotron traveling wave amplifier operating in the TE11 circular mode has been presented. The effects of the parameters such as input power, driver frequency and velocity ratio on the performance of the gyro-TWT ares discussed. The simulation results show that the gain and the bandwidth of the designed Ka-band gyro-TWT is about 54.0 dB and 2.5 GHz with 3 dB bandwidth respectively. The peak...
Nanowires have been predicted to yield significantly improved thermoelectric figures of merit. Here we describe the electron energy spectrum of a resonant tunneling heterostructure nanowire in detail and show how it may be used to realize energy filtering for thermoelectric electronic efficiencies approaching the Carnot limit. A proof-of-principle experiment is described that seeks to demonstrate...
The phase matching angles for second harmonic generation in KBBF have been determined from 194 to 170 nm. The wavelength of 160 nm generated by the 5th harmonic is the shortest ever obtained by nonlinear crystals.
We observe that n-GaAs terahertz emitters with as-grown Be-doped low-temperature-grown (LTG)-GaAs layers exhibits greater radiation power than devices with or without undoped LTG-GaAs layers and explain it by the enhanced electric field in the surface depletion layer.
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