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A device for measuring the non-uniform broadening of the uppermost energy level in the cascade radiation process

A non-uniform broadening and cascading technology, applied in the fields of atomic, molecular and condensed matter science, can solve the problems of broadening limitation, inability to directly obtain the non-uniform broadening of the highest energy level, and inability to remove it, and achieve the effect of expanding the range.

Active Publication Date: 2017-11-28
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The above two methods are limited in the study of the uppermost energy level broadening of cascade radiation due to the fact that they involve direct detection of the actual spectrum of energy level luminescence
Because the spectral broadening of the first photon emitted by the cascade radiation process is the sum of the broadening of the uppermost energy level and the middle energy level, the influence of the middle energy level broadening cannot be removed only from the spectrum, so the non-uniform broadening of the uppermost energy level cannot be directly obtained

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  • A device for measuring the non-uniform broadening of the uppermost energy level in the cascade radiation process
  • A device for measuring the non-uniform broadening of the uppermost energy level in the cascade radiation process
  • A device for measuring the non-uniform broadening of the uppermost energy level in the cascade radiation process

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Embodiment 1

[0035] An embodiment of the present invention provides a device for measuring the non-uniform broadening of the uppermost energy level in the cascade radiation process, which mainly includes: a Franson type interferometer system and a feedback control system;

[0036] The photon pairs emitted by the cascade radiation process pass through the Franson-type interferometer system, and the two-photon correlation signal of the photon pair is detected by the Franson-type interferometer system, thereby obtaining the interference fringes of the Franson interferometer system, by changing the Franson-type interferometer The arm length difference of the system can read the fanson interference visibility in various situations, so as to obtain the situation of non-uniform broadening of the upper energy level;

[0037] The feedback control system is used to calculate the change of the phase difference of the Franson type interferometer system, so as to maintain the relative stability of the F...

Embodiment 2

[0059] In order to further introduce the present invention, the embodiment of the present invention cites specific numerical values ​​to introduce the component parameters in the device; it should be noted that the numerical values ​​of the exemplified component parameters are only for the convenience of understanding the present invention, and do not constitute limitations; In the application, users can use components with different parameters according to their needs or experience.

[0060] In the example of the present invention, the spectrum of the cascaded radiation photon pair is as figure 2 shown. The reference laser wavelength is 920nm, the line width is 1MHz, and the coherence length is 300m.

[0061] In the embodiment of the present invention, after the cascaded radiation photon pairs are collected, the diameter of the outgoing spot is 2 mm, and the spatial parallel separation distance is 5 mm. The first and second polarizing beam splitters are coated with 700-110...

Embodiment 3

[0070] The embodiment of the present invention measures and compares the uniform broadening and total broadening of the uppermost energy level of the cascaded radiation.

[0071] For the uniform broadening of the energy level, it is only related to the radiation lifetime of the emitted photon, so the photon cross-correlation function of the cascaded radiation can be used for analysis, and the single-photon signal generated by the photon pair of the cascaded radiation can be directly input into the time analyzer to obtain the result Such as image 3 As shown, its curve is described by the following differential equations:

[0072]

[0073]

[0074]

[0075] Among them, n G , n X , n XX is the population number of the 3 energy levels of the cascade radiation, τ X , τ XX are the radiation lifetimes of the uppermost and intermediate energy levels, τ e is the parameter of the excitation intensity, and the result of fitting the curve is that the radiation lifetime of ...

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Abstract

The invention discloses a device for measuring the non-uniform broadening of the uppermost energy level in the cascade radiation process. The device comprises: a Franson type interferometer system and a feedback control system; photon pairs emitted by the cascade radiation process pass through the Franson type interferometer , to detect their two-photon correlation signals, so as to obtain the interference fringes of the Franson interferometer system, by changing the arm length difference of the Franson type interferometer system, read the size of the fanson interference visibility in various cases, so as to obtain the highest energy level non-uniformity In the case of widening; the feedback control system is used to calculate the change of the phase difference of the Franson type interferometer system, so as to maintain the relative stability of the Franson type interferometer system. By adopting the device disclosed by the invention, the non-uniform broadening of the uppermost energy level of cascade radiation can be directly measured, thereby expanding the scope of energy level research.

Description

technical field [0001] The invention relates to the field of atomic molecule and condensed matter science, in particular to a device for measuring the non-uniform broadening of the uppermost energy level in the cascade radiation process. Background technique [0002] In many scientific research fields, the non-uniform broadening of the energy level reflects the influence of the material substance by the physical environment in which it is located, and is one of the important physical properties of the material. For the luminous energy level of a single particle, this non-uniform broadening is manifested as some changes in the energy of the emitted photons at different times. Especially in quantum dots, the non-uniform broadening of the energy levels of excitons and biexcitons will affect the entanglement properties of the entangled photon pairs emitted by it. [0003] In the prior art, there are roughly the following methods that can directly measure the non-uniform broaden...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/63G01N21/64
Inventor 邹扬孙永南韩永建李传锋郭光灿
Owner UNIV OF SCI & TECH OF CHINA
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