Terahertz electric field measurement method, system and device

Abstract

The invention provides a terahertz electric field measurement method, system and device. The method comprises the steps that a first laser system emits first-stage pump light and detection light; a second laser system emits high-power pump light; coupling light is generated based on the high-power pump light; based on the first-stage pump light, the detection light and the coupling light, an atomair chamber is reversely entered to prepare Rydberg atoms; a terahertz source is acted on the atomic air chamber; and the electric field of the terahertz source is measured by detecting the atomic spectrum of the Rydberg atoms. According to the invention, alkali metal atoms can be prepared into a Rydberg state, and electric field measurement of sub-THz wave and THz wave radio frequency fields is realized. A Rydberg EIT measurement method does not need a cold atom vacuum system under the action of a laser, and can be operated at a room temperature. Advantages of a wide measurement range, smalland portable experimental device and the like are achieved, and the method is more practical, and realizes the precise measurement of the multi-wave frequency of the THz frequency band.

Description

technical field [0001] The invention relates to the field of quantum precision measurement, in particular to a terahertz electric field measurement method, system and device. Background technique [0002] In the electromagnetic spectrum of various frequency bands, compared with microwave, X-ray and nuclear magnetic resonance detection, THz detection can not only give the density information of the object, but also give the physical property information, such as dielectric constant, refractive index, absorption coefficient, etc. . Due to the special nature of THz, THz technology has great scientific research value and application prospects in many aspects such as object imaging, medical diagnosis, and military radar. Compared with traditional electromagnetic wave imaging, many characteristics of THz wave make it very suitable for imaging applications. [0003] The existing terahertz electric field measurement technology mainly uses a terahertz electro-optic crystal terahert...

AI Technical Summary

Problems solved by technology

[0003] The existing terahertz electric field measurement technology mainly uses a terahertz electro-optic crystal terahertz detector to measure the THz electric field. The terahertz electric field changes the refractive index of the GaP electro-optic crystal to achieve terahertz detection. However, the current cost of using GaP electro-optic crystals is High, and it is difficult to obtain high-quality GaP electro-optic crystals, resulting in inaccurate measurement of terahertz electric fields

Images