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Cold atomic beam producing method and device

A cold atomic beam and generating device technology, applied in phonon exciters, masers, circuits, etc., can solve the problems of atomic wave splitting and interference, large background noise of atomic interference, complex optical system, etc., and achieve optical good effect

Inactive Publication Date: 2006-06-07
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
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Problems solved by technology

But its optical system of corresponding device is complicated with it, and operating skill requirement is high, and is only suitable for the atom interference on the gravitational direction (that is, on the vertical direction), and the atomic flux is also low; In the second method, because will use Zeeman coil , its volume is huge, the coil current is relatively large, and cooling water is required
Although the flux of the obtained cold atomic beam is relatively large, the lateral velocity of the obtained cold atomic beam is relatively large, which brings large background noise to the interference of atoms
In the 2D MOT of the third method, the quadrupole magnetic field formed by four current-carrying wires is used to compress the atoms. The beam tends to heat and expand in the lateral direction during flight, which brings difficulties to the subsequent atom interference and atomic wave division and interference, and greatly introduces background noise. At the same time, the effective atomic flux is also low.

Method used

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  • Cold atomic beam producing method and device

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Embodiment 1

[0053] The device and method for generating cold atomic beams of the present invention will be further described in detail below with reference to the drawings and examples.

[0054] Referring to Fig. 3(a) and Fig. 3(b), a cold atomic beam generating device is manufactured, including: a vacuum chamber and an optical system.

[0055] The vacuum chamber 16 that adopts stainless steel material is welded with the flange that encapsulates quartz glass windows 14, 17, 18, 19, 21, 22, 23, 26, 27, 30, wherein the quartz glass windows 17 and 22 are opposite, and the quartz glass windows 17 and 22 are opposite. Glass windows 26 and 30 are opposite, and these two pairs of quartz glass windows are mutually orthogonally arranged on the wall of vacuum chamber 16; In the vacuum chamber 16, there are grooves at positions 70mm, 305mm and 320mm away from the left end face, and a clamp 29, 31 and 28 made of ceramics is installed in each groove. The diameters of the clamps 29 and 31 are adjustabl...

Embodiment 2

[0058] The method for generating the cold atomic beam of the present invention will be further described in detail below on the device of Example 1 and using the hot atom source as rubidium (Rb) atoms.

[0059] refer to figure 1 , the thermal Rb atom vapor 2 generated by the thermal Rb atom source 1 first fills the vacuum chamber 16, forming a saturated vapor pressure atmosphere of Rb atoms in the vacuum chamber. Then it is carried out on the device of Example 1, and the atoms in the hot Rb atom atmosphere are cooled and trapped to form cold atom clouds 11 under the action of the three-dimensional MOT of Example 1. The three-dimensional MOT is formed in the following way: the laser beam emitted by the laser is split by the beam splitter 4 to form three orthogonal laser beams with equal power; one of the laser beams is converted into a circular beam by a 1 / 4 wave plate Polarized laser beam 5, if the laser beam is σ+, it will form a pair of three-dimensional MOT laser beams wit...

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Abstract

This invention relates to a method and device for generating cold atomic beam. Said method includes heating hot atom source in vacuum chamber to form atomic saturated vapor pressure atmosphere, cooling hot atom by three-D MOT to below 200uk and trapped to form cold atomic cloud, by the quarter wave plate reflection mirror in MOT the laser radiation pressure being unbalanced to make cold atom emitting along said direction, four tape arranged straight line set with contrary current direction is set in atom beam emission direction, which makes the atom emitted to forward to obtain cold atom beam with low speed, large flux and small transverse speed, laser beam vertical with atom beam set in the direction of cold atom emitting for atom beam state preparation to realize state concordant emitted cold atom beam.

Description

technical field [0001] The invention relates to a cold atomic beam generator, in particular, it can provide a cold atomic beam generating method and generating device with good monochromaticity for an atomic interferometer. technical background [0002] There are two main forms of atom beams used in atom interferometers: hot atom beams and cold atom beams. The longitudinal velocity of the atomic beam used by the thermal atomic beam atomic interferometer is relatively high (the longitudinal velocity is the moving speed of the atomic beam in the forward direction, usually >200m / s), but it is aimed at the requirement of good signal-to-noise ratio and detection accuracy of the atomic interferometer , according to the Sagnac effect, the performance of the atom interferometer can be significantly improved by using a cold atom beam (velocity <30m / s), so it is very necessary to develop a continuous cold atom beam. Since the late 1970s, people have used the radiation pressure ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05H3/02
Inventor 周兆英唐兴伦朱荣冯焱颖杨兴
Owner TSINGHUA UNIV
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