A 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 problems such as insufficient utilization and complex optical paths
Inactive Publication Date: 2017-10-17
SHANXI UNIV
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[0005] The present invention is to solve the existing quantum repeater based on the traditional magneto-optical trap [Phys. Rev. Lett. 96,093604 (2006), patent number US 20080258049A1], which is suitable for long-life storage of atoms participating in the four-wave mixing process The band laser and the optical communication band laser suitable for optical fiber long-distance transmission, the optical path is complicated and does not participate in the cooling of atoms, and the technical problem that cannot be fully utilized is to provide a method and device for laser cooling and trapping magneto-optical traps, and propose the first Various combinations of the first cooling light and the second cooling light, 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 layout 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) (L1 L2)+(L2); (c) (L1 L2)+(L1 L2); (d) (L1)+(L1 L2); ( e) (L1) + (L2). Moreover, 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 white ...
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The invention relates to the laser cooling and trapping of step-type energy level alkali metal atoms by lasers of two wavelengths, specifically a magneto-optical trap method for cooling and trapping atoms by using lasers of two wavelengths in the atomic storage band and the optical communication band and device. The method includes the following steps: constructing an atomic vacuum chamber containing a light-transmitting quartz window; constructing the magnetic field part of a magneto-optical trap; constructing the optical path part of the laser working in the ground state and the intermediate excited state of the alkali metal atom; constructing the work in the middle of the alkali metal atom The optical path part of the laser in the excited state and the higher excited state; the detection part of the atomic fluorescence composed of a charge-coupled device camera. The device of the present invention directly cools and captures atoms from a room temperature hot atom vacuum chamber, which can be used for laser cooling and capture of alkali metal atoms with atomic storage band and optical communication band; it can be used for the cooling mechanism of multi-photon cooling atoms And the application research of 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 laser cooling of neutral atoms in experiments It 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 the most active research field in modern physics. one. The ultracold atoms obtained by laser cooling technology have advantages that other states of ma...
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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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