公开(公告)号：US12149041B2

公开(公告)日：2024-11-19

申请号：US17304582

申请日：2021-06-23

Applicant: Tsinghua University

Inventor： Fang Liu ,  Yuechai Lin ,  Jinyu Li ,  Yidong Huang ,  Kaiyu Cui ,  Xue Feng ,  Wei Zhang

IPC: H01S3/0959 ,  G01N21/3581 ,  H01S5/12

Abstract: A terahertz radiator is based on coherent Smith-Purcell radiation amplified by stimulation. The terahertz radiator includes an electron emission source configured to emit electron beams and a pumping source configured to emit pumping signals. The pumping signal interacts with a primary grating structure to obtain preliminarily bunched electrons. The preliminarily bunched electrons interact with the primary grating structure to generate coherent Smith-Purcell radiation. The coherent Smith-Purcell radiation and the pumping signals vertically resonate in a primary resonant cavity structure, so that the electron bunching density is increased, and in turn, the coherent Smith-Purcell radiation is enhanced. A positive feedback process is formed by free electrons and the coherent Smith-Purcell radiation, and the coherent Smith-Purcell radiation amplified by stimulation and periodic bunched electron bunches are obtained. The terahertz radiator can be used to realize a stimulated amplification phenomenon under the conditions of small current and large beam spots.

公开(公告)号：US20210408754A1

公开(公告)日：2021-12-30

申请号：US17304582

申请日：2021-06-23

Applicant: Tsinghua University

Inventor： Fang Liu ,  Yuechai Lin ,  Jinyu Li ,  Yidong Huang ,  Kaiyu Cui ,  Xue Feng ,  Wei Zhang

IPC: H01S3/0959 ,  G01N21/3581

Abstract: A terahertz radiator is based on coherent Smith-Purcell radiation amplified by stimulation. The terahertz radiator includes an electron emission source configured to emit electron beams and a pumping source configured to emit pumping signals. The pumping signal interacts with a primary grating structure to obtain preliminarily bunched electrons. The preliminarily bunched electrons interact with the primary grating structure to generate coherent Smith-Purcell radiation. The coherent Smith-Purcell radiation and the pumping signals vertically resonate in a primary resonant cavity structure, so that the electron bunching density is increased, and in turn, the coherent Smith-Purcell radiation is enhanced. A positive feedback process is formed by free electrons and the coherent Smith-Purcell radiation, and the coherent Smith-Purcell radiation amplified by stimulation and periodic bunched electron bunches are obtained. The terahertz radiator can be used to realize a stimulated amplification phenomenon under the conditions of small current and large beam spots.