Continuous cold-atomic-beam generating device capable of modulating frequency and amplitude

Abstract

The invention discloses a continuous cold-atomic-beam generating device capable of modulating the frequency and the amplitude. The continuous cold-atomic-beam generating device is characterized in that three pairs of cooling laser beams are adopted for resonating with and cooling atoms in a vacuum cavity, and a pair of inverse Helmholtz coils with the exit direction of atomic beams as the axis are additionally arranged to generate capturing force towards the center to the atoms; the three pairs of laser beams are composed of the parallel laser beams generated by three beam expanders respectively and sequentially provided with a 1 / 2 wave plate, a PBS, a 1 / 4 wave plate and a lens and the corresponding reflected laser beams obtained through a 1 / 4 wave plate and a reflecting mirror, wherein the reflected laser beams and incident lasers are same in frequency and opposite in polarization state. A re-pumping laser is coupled into one pair of laser beams to improve the atom use ratio; imbalance laser pressure is formed through a small hole in the center of the 1 / 4 wave plate and a small hole in the center of the reflecting mirror to leak the atoms, and the continuous cold atomic beams are obtained. Interaction force between the laser beams and the atoms is changed by changing the polarization states of the corresponding laser beams in the exit direction of the atomic beams, the speeds and the flux of the atomic beams are continuous and adjustable, and the frequency and the amplitude of the atomic beams can be modulated.

Description

technical field [0001] The invention belongs to a cold atom beam preparation device in the field of quantum physics, in particular to a continuous type cold atom beam preparation device with adjustable 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, which has good coherence, spectral resolution, sensitivity and other characteristics. It has been widely used in ultra-high-resolution spectroscopy, quantum frequency scale, atomic reflection, atomic diffraction, atomic interference, Bose-Einstein condensation (BEC) experiments, atomic lithography, atomic clocks and other fields. [0003] At present, there are two kinds of preparation systems for continuous cold atomic beams: [0004] 1. 3D-MOT, as described in the literature: Z.T.Lu, K.L.Corwin, M.J.Renn, Phys.Rev.Lett., 1996, 77:3331-3334; [0005] 2.2D + - MOT, as ...

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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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