All-optical BEC preparation method based on three-dimensional Raman sideband cooling

An optical and evaporative cooling technology, applied in the field of precision measurement, can solve the problems of unfavorable application in the field of precision measurement, high requirements for magnetic traps, and long preparation time, and achieve the effects of shortening preparation time, improving preparation efficiency and convenient operation.

Active Publication Date: 2020-08-04
LOW SPEED AERODYNAMIC INST OF CHINESE AERODYNAMIC RES & DEV CENT
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Problems solved by technology

[0006] It can be seen that the above-mentioned existing methods all need magnetic traps, and this step takes a long time
That is to say, the above-mentioned classic BEC preparation is realized by magnetic trap loading combined wi...

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  • All-optical BEC preparation method based on three-dimensional Raman sideband cooling
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  • All-optical BEC preparation method based on three-dimensional Raman sideband cooling

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Embodiment Construction

[0034] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0035] Such as figure 1 Shown, a kind of all-optical BEC preparation method based on three-dimensional Raman sideband cooling of the present invention, its steps are:

[0036] Step S1: Preparation of cold atomic groups.

[0037] Six beams of cooling light and back-pumping light in three directions of X-Y-Z form a magneto-optical trap, trapping a group of atoms with a number of about 10 9 At this time, the temperature of the atomic group is relatively high, about 200μK.

[0038] Step S2: Polarization gradient cooling.

[0039] Within a certain period of time (such as within 20ms), linearly reduce the power of the cooling light, and at the same time increase the detuning of the cooling light to -100MHz, complete the polarization gradient cooling process, and obtain cold atomic groups with a temperature of about 15μk. At this time, th...

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Abstract

The invention discloses an all-optical BEC preparation method based on three-dimensional Raman sideband cooling. The all-optical BEC preparation method comprises the steps: S1, preparing a cold atom group; S2, carrying out polarization gradient cooling; S3, carrying out three-dimensional Raman sideband cooling; cooling a group of atoms through a magneto-optical trap and preparing the atoms on a low hyperfine ground state; turning off the light and the magnetic field of the magneto-optical trap, opening an optical lattice, adiabatically loading each atom into each lattice point, and occupying agroup of vibration states according to the initial momentum; introducing a tiny magnetic field, enabling Zeeman splitting to be generated between different magneton energy level states, and cooling the atomic group to a dark state through pump light; S4, loading an optical dipole trap; S5, escaping, evaporating and cooling; and S6, achieving the escape evaporation cooling process by continuouslyreducing the depth of the optical trap, and finally preparing the BEC. The method has the advantages of being simple in principle, convenient to operate, capable of shortening preparation time and improving preparation efficiency and the like.

Description

technical field [0001] The invention mainly relates to the technical field of precision measurement, in particular to an all-optical BEC preparation method based on three-dimensional Raman sideband cooling. Background technique [0002] In 1925, Einstein extended Bose's statistical method for photons to particle systems with mass and discrete energy levels, and then jointly obtained the energy statistical distribution law of Bose-Einstein distribution, predicting the Bose-Einstein The existence of a Einstein condensate (BEC). With the continuous development of laser cooling gas atoms, researchers have the experimental conditions to start exploring the condensate in ideal gas atoms. In 1995, Anderson et al. first observed experimentally 87 A Bose-Einstein condensate of Rb atoms. Subsequently, the research groups of Davis, Bradley and Modugno realized the Bose-Einstein condensates of sodium, lithium and potassium respectively. [0003] At present, the preparation of BEC ad...

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Application Information

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IPC IPC(8): G21K1/00G21K1/093
CPCG21K1/00G21K1/093
Inventor 魏春华梁磊马军左承林岳廷瑞尹熹伟刘垒
Owner LOW SPEED AERODYNAMIC INST OF CHINESE AERODYNAMIC RES & DEV CENT
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