Terahertz Radiator Based on Stimulated Amplified Coherent SPR Radiation

Abstract

An embodiment of the present invention provides a terahertz radiator based on stimulated amplified coherent Smith-Purcell radiation, including: an electron emission source, used to emit electron beams; a pump source, used to emit a pump signal, and the pump signal and The first-level grating structure interacts to obtain preliminary group electrons; the preliminary group electrons interact with the first-level grating structure to generate coherent Smith-Purcell radiation; vertically resonate with the pump signal in the first-level resonant cavity structure, making the electron group The density increases, which in turn enhances the coherent Smith-Purcell radiation; free electrons and coherent Smith-Purcell radiation form a positive feedback process, resulting in stimulated and amplified coherent Smith-Purcell radiation and periodic grouping of electron clusters. The terahertz radiator provided by the embodiment of the present invention can realize the phenomenon of stimulated amplification under the condition of small current and large beam spot.

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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