Device for measuring inhomogeneous broadening at highest energy level during cascade radiation
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.
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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] dn G d t = - n G τ e + n X τ X ...
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