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Active laser frequency standard based on four-energy-level quantum system

A four-level, quantum technology, applied in lasers, phonon exciters, laser components, etc., can solve problems such as limiting the standard accuracy of laser frequency, and achieve the effect of avoiding optical frequency shift, avoiding overlap, and reducing noise.

Active Publication Date: 2012-07-18
PEKING UNIV
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Problems solved by technology

For beam-type active laser frequency standards, the accuracy of the laser frequency standard is limited due to residual Doppler shift
Based on the active laser frequency standard of the trapped quantum system, intracavity pumping can increase the output laser power and is expected to eliminate the Doppler effect; but there are still some problems, mainly the optical frequency shift of the trapped light field and the pump light field optical frequency shift

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  • Active laser frequency standard based on four-energy-level quantum system
  • Active laser frequency standard based on four-energy-level quantum system
  • Active laser frequency standard based on four-energy-level quantum system

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Embodiment Construction

[0025] In order to make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be described in detail below through the embodiments and in conjunction with the accompanying drawings.

[0026] A typical four-level quantum system selected in this embodiment is a rubidium atom, and its energy level structure diagram is as follows figure 1 As shown, the order from low energy level to high energy level is the first, second, third and fourth energy levels. The basic principle of active laser generation based on the four-level quantum system of rubidium atoms is briefly described as follows:

[0027] 1) Using rubidium atomic gas as the gain medium, first use a beam of 421nm laser corresponding to the transition wavelength of the rubidium atomic energy level 5S to 6P as the pumping light to pump the rubidium atoms;

[0028] 2) Under the action of pump light, it is in the ground stat...

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Abstract

The invention provides a device and a method for generating an active laser frequency standard based on a four-energy-level quantum system. An air chamber in which a gain medium is filled is formed in a Fabry-Perot cavity, wherein the gain medium is the atomic gas of the four-energy-level quantum system. Pumping laser is emitted into one end of the Fabry-Perot cavity, and the atomic gas is excited from a ground-state energy level to a fourth energy level. Atoms in the fourth energy level are transited to a low energy level through spontaneous radiation, and atom population inversion is realized between a third energy level and a second energy level. The atoms in the third energy level are transited to the second energy level through spontaneous radiation or stimulated radiation photons, stimulated radiation is generated under the action of the Fabry-Perot cavity, and laser is output from the other end of the Fabry-Perot cavity. The active laser frequency standard is high in frequency stability and accuracy.

Description

technical field [0001] The invention belongs to the field of laser technology and time-frequency standard technology, and relates to four-level quantum system laser technology, in particular to a device and method for generating an active laser frequency standard based on a four-level quantum system, which can output a line width much larger than that of an atom. A laser with a small natural linewidth of the spectrum. Background technique [0002] Using atomic frequency standards to measure is the most accurate of all scientific measurement methods, and it has a very wide range of scientific research and practical application values. Utilizing the high accuracy of the atomic frequency standard, it is possible to measure the basic parameters of atoms and molecules, measure the relevant physical quantities of cosmology and astronomy, and discover and recognize new physical phenomena on the experimental platform of higher precision measurement. In terms of application, the ato...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S3/00H01S3/227
Inventor 陈景标庄伟张同刚
Owner PEKING UNIV
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