Microwave electric field intensity measurement method and measurement device

Abstract

The invention discloses a microwave electric field intensity measurement method and a measurement device. The measurement method comprises the steps that coupling light and probing light generated by a laser excite clod atoms in vacuum equipment from a ground state to the Rydberg state coherently; the ground state and the Rydberg state are taken as two internal states of the Raman effect, the appropriate detuning is selected, microwaves generated by a microwave source are applied to the clod atoms, and a Raman absorption peak of the clod atoms is enabled to split; the splitting width of the Raman absorption peak is measured, and the electric field intensity of the microwave source is calculated according to the splitting width. The measurement method disclosed by the invention is based on a technology of cold Rydberg atom manipulation, utilizes the Raman effect to suppress spontaneous radiation to realize narrow-linewidth absorption peak splitting, realizes the purpose of improving the microwave electric field measurement accuracy by an order of magnitude through measuring the splitting width of the Raman absorption peak, and thus provides a new technology foundation for studying precision measurement for the microwave electric field.

Description

Technical field [0001] The invention relates to a microwave electric field intensity measuring method and measuring device. Background technique [0002] In 2012, the Shaffer research group of Oklahoma University in the United States and the Pfau research group of Stuttgart University in Germany used the Rydberg atom EIT and AT (Autler-Townes) split for the first time to convert the measurement of microwave electric field strength into optical frequency measurement, which was realized experimentally Microwave electric field measurement, the minimum electric field intensity measured is 8μVcm 1 , The sensitivity is 30μVcm -1 Hz -1 / 2 , Far better than the traditional dipole antenna microwave electric field meter. Then in 2013, they realized the measurement of the microwave polarization direction based on the original experiment, and the polarization measurement accuracy was 0.5°. In 2014, the National Institute of Standards and Technology (NIST) experimentally realized high-precisi...

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Problems solved by technology

[0003] However, according to the current experimental measurement and theoretical analysis, the measurement accuracy of the microwave electric field based on the EIT slow light effect of Rydberg atoms is limited by the width of the probe light transparent window, which is limited by the laser line width, transition Effects of Broadening, Shot Noise, and Rydberg Atom Decoherence

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