Method and device for direct generation of ultracold ground-state diatomic cesium molecule and its measurement

Abstract

The invention relates to an ultra-cool molecule preparation and measurement technique, and particularly relates to a method and a device for directly producing and measuring an ultra-cool ground state double-atom cesium molecule, solving the problems that the existing ultra-cool ground state double-atom cesium molecule preparation and measurement technique is high in the temperature requirement of the ultra-cool cesium molecule, the formed ultra-cool ground state double-atom cesium molecule is easily decomposed to two atoms, the yield of the ultra-cool ground state double-atom cesium molecule is low, the formed ultra-cool ground state double-atom cesium molecule is damaged during the measurement and the technological difficulty is large. The method for directly producing and measuring the ultra-cool ground state double-atom cesium molecule comprises the following steps: a. cooling cesium atoms to form ultra-cool cesium atoms; b. forming a long-range excited state double-atom cesium molecule from the ultra-cool cesium atoms under the action of photo-association lasers; c. tunneling the long-range excited state double-atom cesium molecule to form a short-range excited state double-atom cesium molecule; and d. collecting fluorescence with a lens. The method and the device provided by the invention are used for preparing and measuring the ultra-cool ground state molecules.

Description

technical field [0001] The invention relates to ultra-cold molecule preparation and measurement technology, in particular to a method and device for directly producing ultra-cold ground-state diatomic cesium molecules and measuring the same. Background technique [0002] Since its birth, laser has been widely used in many fields such as industry, military, communication and scientific research because of its good monochromaticity, directionality and coherence. In particular, the research on laser-cooled atoms and Bose-Einstein condensates of atoms, which won the Nobel Prize in Physics, is a milestone, opening up new fields of atomic, molecular and photophysical research. It's a perfectly natural idea to go from laser cooling atoms to laser cooling molecules. But even for the simplest diatomic molecules, the vibration-rotational energy level structure is quite complex, and it is almost impossible to achieve molecular cooling by cyclical transitions in a closed two-level syst...

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Problems solved by technology

[0004] In order to solve the problem that the existing ultra-cold ground-state diatomic cesium molecule preparation and measurement technology requires high temperature of ultra-cold cesium atoms, the formed ultra-cold ground-state diatomic cesium molecule is easy to decompose into two atoms, ultra-cold ground-state diatomic cesium molecule For the problems of low yield, damage to the formed ultracold ground state diatomic cesium molecules during the measurement process, and high technical difficulty, a method and device for directly producing ultracold ground state diatomic cesium molecules and their measurement are provided

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