Method and device used for preparing ultra long type cold atomic cloud asymmetric two-dimensional magnetic optical trap

Abstract

The invention belongs to the field of atom cooling and capturing technology, and provides a method and a device used for preparing an ultra long type cold atomic cloud asymmetric two-dimensional magnetic optical trap. The method comprises following steps: 6 cooling light beams enters into a MOT glass cavity, and meet at a point, the 6 cooling light beams are divided into three pairs, and the two light beams in each cooling light beam pair are designed to be correlation overlapped, the first cooling light beam pair is designed to travel along the X axis direction, and the second cooling light beam pair and the third cooling light beam pair are designed in the Y/Z plane with an angle equal to or larger than 120 DEG; a first rectangular coil pair parallel to the Y/Z plane and a second rectangular coil pair parallel to be X/Z plane are arranged at the surrounding of a window of the MOT glass cavity, the length of the second rectangular coil pair is designed to be 1.5 times of the length ofthe first rectangular coil pair, and the first rectangular coil pair and the second rectangular coil pair are all anti-Helmholtz coils. The method and the device can be used for preparing high atom number and high optical thickness ultra long cigar-shaped cold cesium atom cloud, and providing high quality experiment mediums for quantum coherence effect, quantum storage, and quantum precision measuring researches.

Description

technical field [0001] The invention belongs to the cooling and trapping technology of atoms, in particular to an asymmetric two-dimensional magneto-optical trap method and device for preparing ultra-long cigar-shaped cold atom clouds. Background technique [0002] At room temperature, the speed of gas atoms is hundreds of meters per second, and the Doppler spectral line broadening can reach hundreds of MHz, which greatly affects the accurate detection of physical phenomena in atoms. The use of magneto-optical trap (MOT: magneto-optical trap) system to cool and trap neutral atoms is currently the most widely cited laser cooling technology. This method effectively eliminates the influence of Doppler broadening, and even makes the temperature of atoms infinite Close to absolute zero [Phy. Rev. Lett. 69, 1741]. As early as 1975, Hansch and Schawlow proposed the use of single-frequency laser to cool neutral atoms, and then Zhu Diwen and others used optical sticky group technolo...

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Problems solved by technology

[0004] Therefore, the traditional two-dimensional MOT device still has defects, especially for further experimental research on quantum storage, nonlinear effects, multi-level EIT, etc., it

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