Differential absorption method-based atomic density and population measuring device and method

A technology of atomic density and differential absorption, which is applied in the direction of measuring devices, specific gravity measurement, color/spectral characteristic measurement, etc., can solve the problems of limited application, achieve the effect of improving accuracy and eliminating instability

Active Publication Date: 2019-08-20
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

This technique is suitable for cold atomic ensembles

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  • Differential absorption method-based atomic density and population measuring device and method
  • Differential absorption method-based atomic density and population measuring device and method
  • Differential absorption method-based atomic density and population measuring device and method

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Embodiment Construction

[0047] The present invention will be described in detail below in conjunction with specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0048] According to the present invention, a measuring device for atomic density and population number based on differential absorption method includes a first coherent light source 1, a first isolator 3, a first pulse modulator 5, a second coherent light source 2, a second Isolator 4, second pulse modulator 6, beam splitter 7, atomic vapor cell 8, first optical filter 11, first photodetector 13, mirror 9, adjustable attenuation sheet 10, second optical filter 12. A second photodetector 14, a subtractor...

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Abstract

The invention provides a differential absorption method-based atomic density and population measuring device and method. According to the differential absorption method-based atomic density and population measuring device and method of the invention, two pulse light sources are adopted, wherein one of the pulse light source serves as signal light, and the other pulse light source serves as opticalpumping light; after the two beams of light are combined, the combined light is transmitted along two light paths, wherein one of the two light paths is provided with an atomic pool and serves as a signal light path, and the other light path is not provided with any atomic pool and serves as a calibration light path of absorption spectral lines; after the two paths of light are converted into electric signals through a detector, the two paths of electric signals are subtracted from each other; and therefore, influence in the absorption spectral lines which is caused by the instability of thelight paths and the light sources can be removed, and measurement accuracy is improved. Atomic density at each energy level is determined through each fine absorption peak of the absorption spectral lines, and therefore, the blank of the population measurement of each atomic level can be filled. The method can be further used for measuring the initial states of atoms prepared by optical pumping.

Description

technical field [0001] The invention relates to the technical field of quantum precision measurement, in particular to a device and method for measuring atomic density and population number based on a differential absorption method. Background technique [0002] Due to its good coherence, the atomic ensemble is widely used in the fields of atomic molecules and photophysics as an important research medium. At the same time, the accurate measurement of atomic density and the accurate manipulation and measurement of the population number of each energy state of atoms are the basis in the fields of atomic physics, quantum physics, nonlinear optics, etc., and have extremely important research significance. In recent years, the thermal atomic ensemble has become the key research object of many researchers because of its unique and easy-to-integrate characteristics. The atomic density measurement of hot atoms and the manipulation and measurement of atomic energy state population n...

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Application Information

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IPC IPC(8): G01N9/24G01N21/31
CPCG01N9/24G01N21/3103
Inventor 郭进先吴媛明胜
Owner SHANGHAI JIAO TONG UNIV
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