Title:
TERAHERTZ WAVE BALANCE DETECTION SYSTEM AND METHOD BASED ON LASER-AIR INTERACTION
Document Type and Number:
WIPO Patent Application WO/2023/222102
Kind Code:
A1
Abstract:
Disclosed are a terahertz wave balance detection system and method based on a laser-air interaction. The system specifically comprises: a coupler that is used for collimating, combining and focusing a detection laser beam and a terahertz wave, and generating terahertz induced second harmonic (TISH); a β-BBO crystal that is disposed behind a focus, the β-BBO crystal interacting with the residual detection laser beam to generate local oscillation second harmonic (LO), and polarizations of the LO and the TISH being perpendicular to each other; an α-BBO crystal that enables incident LO and TISH to be time-synchronized; a quarter-wave plate that converts the incident LO and TISH into a circularly polarized state; and a balance detection module that performs beam-splitting measurement on the circularly polarized LO and the circularly polarized TISH and then performing differential processing to obtain the electric field intensity of the terahertz wave. According to the technical solution disclosed in the present invention, the order in which the TISH and LO are generated is adjusted, and a differential technique is combined, so that the signal to noise ratio of detection is enhanced, the stability of detection is improved, and the industrial integration of the system is facilitated.
Inventors:
LV ZHIHUI (CN)
MENG CONGSEN (CN)
ZHANG DONGWEN (CN)
WANG XIAOWEI (CN)
ZHAO ZENGXIU (CN)
YUAN JIANMIN (CN)
MENG CONGSEN (CN)
ZHANG DONGWEN (CN)
WANG XIAOWEI (CN)
ZHAO ZENGXIU (CN)
YUAN JIANMIN (CN)
Application Number:
PCT/CN2023/095170
Publication Date:
November 23, 2023
Filing Date:
May 19, 2023
Export Citation:
Assignee:
NATIONAL UNIV OF DEFENSE TECHNOLOGY (CN)
International Classes:
G02B27/28; H01S3/10
Foreign References:
| CN115241725A | 2022-10-25 | |||
| CN105841816A | 2016-08-10 | |||
| CN107015414A | 2017-08-04 | |||
| CN114389125A | 2022-04-22 | |||
| CN113872022A | 2021-12-31 | |||
| JP2008010637A | 2008-01-17 |
Attorney, Agent or Firm:
CHANGSHA YIBAI PATENT AGENCY (GENERAL PARTNERSHIP) et al. (CN)
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