A continuous cold atomic beam preparation device with adjustable frequency and amplitude

Abstract

A continuous-type cold atom beam preparation device with adjustable frequency and amplitude modulation, which adopts three pairs of cooling laser beams to resonate and cool the atoms in a vacuum cavity, plus a pair of anti-Helmholtz coil pairs with the exit direction of the atomic beams as the axis The atoms generate a trapping force towards the center; the three pairs of laser beams are generated by three beam expanders equipped with 1 / 2 wave plate, PBS, 1 / 4 wave plate and lens in sequence, and the corresponding 1 / 4 wave plate It is composed of a reflected beam of the same frequency and opposite polarization state as the incident light reflected by the mirror; a pair of laser beams is coupled with a pump light to improve the atomic utilization rate; the 1 / 4 wave plate and the The small hole in the center of the mirror forms an unbalanced light pressure to leak out the atoms to obtain a continuous cold atomic beam; by changing the polarization state of the corresponding laser beam in the exit direction of the atomic beam, the interaction force between the laser beam and the atom is changed, and the speed and flux of the atomic beam are realized. The amount is continuously adjustable, that is, the frequency and amplitude modulation of the atomic beam is realized.

Description

technical field [0001] The invention belongs to a cold atomic beam preparation device in the field of quantum physics, in particular to a continuous cold atomic beam preparation device capable of frequency and amplitude modulation. Background technique [0002] Cold atomic beam is an atomic beam with low velocity, narrow velocity distribution and small divergence angle produced by laser cooling effect, and has good coherence, spectral resolution, sensitivity and other characteristics. It has been widely used in ultra-high resolution spectroscopy, quantum frequency standards, atomic reflection, atomic diffraction, atomic interference, Bose-Einstein condensate (BEC) experiments, atomic lithography, atomic clocks and other fields. [0003] Currently, there are two types of continuous cold atom beam preparation systems: [0004] 1. 3D-MOT, as documented in: Z.T.Lu, K.L.Corwin, M.J.Renn, Phys.Rev.Lett., 1996, 77:3331-3334; [0005] 2.2D + -MOT, as documented in: Simone Gotz, B...

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Problems solved by technology

[0008] Although the above two devices can realize the change of atomic beam velocity and flux, the system is more complex and the operation is more cumbersome, and the changes of the obtained velocity and flux values ​​are not continuous. Therefore, a simple velocity and flux value A device with adjustable volume is of great significance in the application of cold atomic beams

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