Magneto-optical trap method and device for laser cooling and trapping
A technology of laser cooling and magneto-optical traps, which is applied in the direction of nanotechnology, instruments, and calculation models for information processing, and can solve the problems of complex optical paths and insufficient utilization
Inactive Publication Date: 2015-12-02
SHANXI UNIV
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[0005] The present invention is to solve the existing quantum repeater based on traditional magneto-optical trap [Phys.Rev.Lett.96,093604(2006), patent number US20080258049A1] The laser in the wavelength band suitable for long-life storage of atoms and the laser in the optical communication band suitable for long-distance transmission of optical fibers that participate in the four-wave mixing process have complex optical paths and do not participate in atomic cooling. Technical problems that cannot be fully utilized provide a laser The magneto-optical trap method and device for cooling and trapping, various combinations of the first cooling light and the second cooling light are proposed at the same time, the device is flexible, and meets the needs of various potential applications
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[0040] (4) According to figure 1 Build a magneto-optical trap optical path arrangement unit, wherein the cooling light in the z direction from 40 to 41 can be replaced or can be any of the following combinations (the first cooling laser is represented by L1, and the second cooling laser is represented by L2) : (a) (L2)+(L2); (b) (L1L2)+(L2); (c) (L1L2)+(L1L2); (d) (L1)+(L1L2); (e) (L1 )+(L2). In addition, the optical path arrangement corresponding to the x, y, and z axes can be exchanged arbitrarily to meet the requirements of different experimental parameters. In the case of insufficient power of the second cooling laser, an appropriate optical path arrangement can also be selected to achieve cooling. The variation of the peak fluorescence signal of the atomic group with the two-photon detuning under different combinations is as follows: Figure 5 shown.
[0041] (5) According to figure 1 Build an atomic fluorescence collection unit, aim the lens of the CCD black and whit...
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The invention relates to laser cooling and trapping of ladder-type energy level alkaline metal atoms by means of laser of two wavelengths, particularly relates to a magneto-optical trap method and a magneto-optical trap device for cooling and trapping atoms by utilizing a laser device with two wavelengths at an atom storage band and an optical communication band. The magneto-optical trap method comprises the steps of: constructing an atom vacuum chamber provided with light-transmitting quartz windows; constructing a magnetic field part of a magneto-optical trap; constructing a light path part of laser operating in a ground state and a middle excited state of alkaline metal atoms; and constructing a atomic fluorescence detection part composed of a charge-coupled device camera. According to the magneto-optical trap device, the atoms can be directly cooled and captured from the atom vacuum chamber at room temperature, the magneto-optical trap device can be used for cooling and trapping the alkaline metal atoms by means of laser with the atom storage band and the optical communication band, and can be applied to application research of a cooling mechanism for multiphoton cooling atoms and a quantum repeater based on four-wave mixing.
Description
technical field [0001] The invention relates to the laser cooling and trapping of step-type energy level alkali metal atoms by lasers with two wavelengths, specifically a magneto-optical trap that uses two wavelengths of lasers in the atomic storage band and the optical communication band to cool and trap atoms Methods and devices. Background technique [0002] Since Hansch and Schawlow proposed laser cooling of neutral atoms in 1975, and in 1985, William Phillips of the National Institute of Standards and Technology and Steven Chu of Stanford University first realized the laser cooling of neutral atoms and The capture has greatly promoted the development and application of cold atomic physics, such as atomic clocks, optical tweezers, Bose-Einstein condensates, atomic lasers, high-resolution spectroscopy, etc., and has become one of the most active research fields in modern physics. one. The ultracold atoms obtained by laser cooling technology have advantages that other st...
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IPC IPC(8): G06N99/00B82Y10/00
Inventor 王军民王杰杨保东杨光刘慧丰
Owner SHANXI UNIV
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