Terahertz radiator based on stimulated amplification coherent SPR radiation

Abstract

The embodiment of the invention provides a terahertz radiator based on stimulated amplification coherent Smith-Purcell radiation, and the terahertz radiator comprises an electron emission source whichis used for emitting an electron beam; a pumping source, used for emitting a pumping signal, and the pumping signal interacting with the primary grating structure to obtain primary cluster electrons.The preliminary cluster electrons interact with the primary grating structure to generate coherent Smith-Purcell radiation. Vertical resonance with a pumping signal is carried out in the first-stageresonant cavity structure, so that the electron bunching density is increased, and the coherent Smith-Purcell radiation is enhanced. A positive feedback process is formed by the free electrons and thecoherent Smith-Purcell cell radiation, and the stimulated and amplified coherent Smith-Purcell cell radiation and periodic cluster electron groups are obtained. The terahertz radiator provided by theembodiment of the invention can realize the stimulated amplification phenomenon under the conditions of small current and large beam spots.

Description

technical field [0001] The invention relates to the field of terahertz radiation sources, in particular to a terahertz radiator based on stimulated amplified coherent Smith-Purcell radiation. Background technique [0002] After in-depth research, it is found that the existing THz-Terahertz radiation sources based on vacuum electronic devices are very difficult to achieve high-frequency THz radiation (greater than 0.3THz). Especially in order to achieve stimulated Smith-Purcell radiation, the electron gun needs to meet extremely high requirements. The beam current of the electron gun needs to meet the following two conditions: first, the beam spot diameter of the electron gun needs to be small enough to ensure the electron beam and slow wave structure The action distance between them is close enough to generate a radiation field; secondly, the current intensity of the electron beam needs to be large enough to meet the gain condition of electron stimulated emission. [0003] ...

AI Technical Summary

Problems solved by technology

However, due to the harsh conditions such as electron beam focusing, current intensity, and the distance between the electron beam and the grating, as the frequency increases (greater than 0.3THz), the electron beam and the grating are stimulated by back wave modulation electrons. The amplification scheme is difficult to realize, that is, the stimulated amplification phenomenon cannot be realized under the conditions of small current and large beam spot

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