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Journal of Henan Normal University

Theoretical Analysis of Characteristics of Cs Faraday Anomalous Dispersion Optical Filtering's Use in Edge Filters

Yongtao Zhang

Published Jan 1, 2006• 0 citations
OpenAlex

Abstract

The use of Faraday anomalous dispersion optical filtering in edge filters was proposed,which can cover the shortages of edge filters in using resonant transitions in the ~(127)I_2 and ~(129)I_2 molecules. The characteristics of filtering and frequency tuning of Faraday anomalous dispersion spectrum of Cs 6S_(1/2)7P_(1/2) transition were analyzed theoretically.The results show that there are two steep transmission peaks in line-wing symmetrically in the Faraday anomalous dispersion spectrum of Cs atoms,by adjusting the temperature of atomic vapor cell and the external magnetic field strength,the central frequencies of the transmission peaks in line-wing can be tuned to the desired locations.

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The characteristics of Stark tuned Faraday anomalous dispersion optical filter at 459nm

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Analyses of Transmission Characteristics of a Magneto-Optic Material Used for Faraday Optical Filters at 532nm

Yufeng Peng, Wen Jin Zhang

In this paper, the transmission characteristics of rubidium excited state Faraday anomalous dispersion optical filters at 532nm for a practical and important wavelength are analyzed and discussed. A weak magnetic field method is employed to calculate the transmission characteristics versus external magnetic field, laser pump power, cell temperature and cell length for natural Rb, 85Rb and 87Rb atomic vapors, respectively. The theoretical results show that the transmission property of 85Rb atomic vapor is superior to that of Rb, 87Rb atomic vapors in the weak magnetic field, which makes it more suitable for the magneto-optic filtering material of Faraday optical filters by comparison with natural Rb atomic vapor.

Advanced materials research•Jul 4, 2011•0 citations
The use of Faraday anomalous dispersion optical filtering in edge filters was proposed,which can cover the shortages of edge filters in using resonant transitions in the ~(127)I_2 and ~(129)I_2 molecules. The characteristics of filtering and frequency tuning of Faraday anomalous dispersion spectrum of Cs 6S_(1/2)7P_(1/2) transition were analyzed theoretically.The results show that there are two steep transmission peaks in line-wing symmetrically in the Faraday anomalous dispersion spectrum of Cs atoms,by adjusting the temperature of atomic vapor cell and the external magnetic field strength,the central frequencies of the transmission peaks in line-wing can be tuned to the desired locations.
The characteristics of cesium Stark tuned Faraday anomalous dispersion optical filter(S-FADOF) at 459nm are theoretically analyzed.The transmission spectrum of cesium S-FADOF at 459nm is calculated,then compared with that of cesium FADOF at 459nm in the same condition.The influence of different magnetic strength and temperature on the transmission spectrum of cesium S-FADOF at 459nm is analyzed.The calculated curve of the central frequency shift of the transmission spectrum of cesium S-FADOF at 459nm as a function of electric field is also given.The results show that external electric field doesn't change the structure of transmission spectrum and only causes the central frequency shift which increases with the enhancement of the electric field.
Abstract This paper proposes a Faraday anomalous dispersion optical filter that uses rare earth-doped crystals to overcome the limitations of current atomic filtering technology, which include limited working wavelength and Doppler broadening. The paper analyses Er3+: LiYF4 1530 nm as an example filter. The results show that the proposed filter achieves high transmission while maintaining an ultra-narrow bandwidth transmission spectrum. The maximum transmission efficiency reaches 94.8% with a transmission bandwidth of hundred trillions HZ. The position of the transmission peak can be tuned by adjusting the size of the magnetic field, enabling the conversion of the transmission spectrum between the line center and the line wing.
We demonstrate a Cs FADOF (Faraday anomalous dispersion optical filter) with a single transmission peak resonant with the 6S(1/2), F = 4 → 7P(3/2), F' = 3, 4, 5 transition at 455 nm. The filter achieves a single peak transmission of 86%. With the technique of saturated absorption spectra, we obtain the bandwidth of the single peak, which is 1.5 GHz. While most of other FADOFs operate at frequencies far from absorption, the filter we have realized can provide light exactly resonant with atomic transitions with a high transmission. We also find that, at a particular temperature, we can achieve a single transmission peak rather than many peaks far from absorption by changing the strength of magnetic field. This technique can also be applied to other alkali atoms.
Abstract A narrow linewidth Faraday anomalous dispersion optical filter (FADOF) with reflection configuration is achieved for the first time based on the cesium (Cs) ground state 6S1/2 to the excited state 6P3/2 transition at 852 nm. Compared with the conventional FADOF with transmission configuration, reflection-type FADOF can greatly improve the transmittance of optical filter under the same experimental parameters, because it allows signal light to go and return through the atomic vapor cell. In our experiment, peak transmittance at Cs 6S1/2 F = 4–6P3/2 transition is 81% for the reflection-type FADOF, and while 54% for the transmission-type FADOF when the temperature of Cs vapor cell and the axial magnetic field are 60 °C and 19 G. The idea of this reflection-type FADOF design has the potential to be applied to the FADOF operating between two excited states to obtain higher transmittance.
In this paper, the transmission characteristics of rubidium excited state Faraday anomalous dispersion optical filters at 532nm for a practical and important wavelength are analyzed and discussed. A weak magnetic field method is employed to calculate the transmission characteristics versus external magnetic field, laser pump power, cell temperature and cell length for natural Rb, 85Rb and 87Rb atomic vapors, respectively. The theoretical results show that the transmission property of 85Rb atomic vapor is superior to that of Rb, 87Rb atomic vapors in the weak magnetic field, which makes it more suitable for the magneto-optic filtering material of Faraday optical filters by comparison with natural Rb atomic vapor.