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Manned Spaceflight

Faraday Anomalous Dispersion Optical Filter and its Application

Hong Mei Guo

Published Jan 1, 2012• 0 citations
OpenAlex

Abstract

An application of a high-performance ultra-narrow band optical filter-Faraday anomalous dispersion optical filter(FADOF)is introduced,which can be used in wireless optical communication of manned space engineering.The performance parameters of the Cs-FADOF are presented.A frequency stabilized beacon light system based on Cs-FADOF is designed,which can automatically stabilize the output frequency on a FADOF's transmission peak,with the frequency stability reach a level of 3.4x10-9.The current application scenarios of FADOF are summarized,and the main research directions in manned space engineering are presented,which can provide support for the future development of manned engineering program.

Related papers

Hollow cathode lamp based Faraday anomalous dispersion optical filter

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The Faraday anomalous dispersion optical filter (FADOF), which has acquired wide applications, is mainly limited to some gaseous elements and low melting-point metals before, for the restriction of the attainable atomic density. In conventional FADOF systems a high atomic density is usually achieved by thermal equilibrium at the saturated vapor pressure, hence for elements with high melting-points a high temperature is required. To avoid this restriction, we propose a scheme of FADOF based on the hollow cathode lamp (HCL), instead of atomic vapor cells. Experimental results in strontium atoms verified this scheme, where a transmission peak corresponding to the (88)Sr (5s(2))(1)S0 - (5s5p)(1)P1 transition (461 nm) is obtained, with a maximum transmittance of 62.5% and a bandwith of 1.19 GHz. The dependence of transmission on magnetic field and HCL discharge current is also studied. Since the state-of-art commercial HCLs cover about 70 elements, this scheme can greatly expand the applications of FADOFs, and the abundant atomic transitions they provide bring the HCL based FADOFs potential applications for frequency stabilization.

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Demonstration of Faraday anomalous dispersion optical filter with reflection configuration

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The characteristics of a potassium Faraday anomalous dispersion optical filter operating on the blue and near infrared transitions are calculated. The results show that the filter can be designed to provide high transmission, very narrow pass bandwidth, and low equivalent noise bandwidth. The Faraday anomalous dispersion optical filter (FADOF) provides a narrow pass bandwidth (about GHz) optical filter for laser communications, remote sensing, and lidar. The general theoretical model for the FADOF has been established in our previous paper. In this paper, we have identified the optimum operational conditions for a potassium FADOF operating on the blue and infrared transitions. The signal transmission, bandwidth, and equivalent noise bandwidth (ENBW) are also calculated.

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Using a hollow-cathode lamp (HCL) to build a Faraday anomalous dispersion optical filter (FADOF) is a new method to realize narrow linewidth optical filters. In contrast to other atomic optical filters based on saturated vapors, which work at a relatively high temperature to maintain the atomic density, the HCL device using sputtered particles can work at a much lower temperature. In this work, a rubidium HCL-based FADOF (HCL-FADOF) working at 780 nm is established and carefully tested. With 20 mm cathode length, the transmittance can reach 29% under 18 mA discharge current and 260 G magnetic field at room temperature, which is equivalent to the performance of a saturated vapor-based FADOF (VC-FADOF) at more than 60 ∘C. This work provides a direct comparison of the performance of the HCL-FADOF and the VC-FADOF, which is of great benefit to further studies of atomic filters at normal temperature.

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The function and requirements of optical filter for different systems are introduced,whereby the distinctions of atomic optical filter in comparison to the traditional optical filter are presented and the development of atomic filter is summarized.Furthermore,a general model for calculating the transmittance of Faraday anomalous dispersion optical filter (FADOF) is presented,which is applicable for both passive and active working modes of FADOF.It shows that the theoretical calculation match the experimental results perfectly.Also,we report the progress on the theory and experiment research of passive and active FADOF in our group.

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Faraday anomalous dispersion optical filter

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The function and requirements of optical filter for different systems are introduced, whereby the distinctions of atomic optical filter in comparison to the traditional optical filter are presented and the development of atomic filter is summarized. Furthermore, a general model for calculating the transmittance of Faraday anomalous dispersion optical filter (FADOF) is presented, which is applicable for both passive and active working modes of FADOF. It shows that the theoretical calculation match the experimental results perfectly. Also, we report the progress on the theory and experiment research of passive and active FADOF in our group.

Chinese Science Bulletin (Chinese Version)•Mar 1, 2010•17 citations
An application of a high-performance ultra-narrow band optical filter-Faraday anomalous dispersion optical filter(FADOF)is introduced,which can be used in wireless optical communication of manned space engineering.The performance parameters of the Cs-FADOF are presented.A frequency stabilized beacon light system based on Cs-FADOF is designed,which can automatically stabilize the output frequency on a FADOF's transmission peak,with the frequency stability reach a level of 3.4x10-9.The current application scenarios of FADOF are summarized,and the main research directions in manned space engineering are presented,which can provide support for the future development of manned engineering program.
The Faraday anomalous dispersion optical filter (FADOF), which has acquired wide applications, is mainly limited to some gaseous elements and low melting-point metals before, for the restriction of the attainable atomic density. In conventional FADOF systems a high atomic density is usually achieved by thermal equilibrium at the saturated vapor pressure, hence for elements with high melting-points a high temperature is required. To avoid this restriction, we propose a scheme of FADOF based on the hollow cathode lamp (HCL), instead of atomic vapor cells. Experimental results in strontium atoms verified this scheme, where a transmission peak corresponding to the (88)Sr (5s(2))(1)S0 - (5s5p)(1)P1 transition (461 nm) is obtained, with a maximum transmittance of 62.5% and a bandwith of 1.19 GHz. The dependence of transmission on magnetic field and HCL discharge current is also studied. Since the state-of-art commercial HCLs cover about 70 elements, this scheme can greatly expand the applications of FADOFs, and the abundant atomic transitions they provide bring the HCL based FADOFs potential applications for frequency stabilization.
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.
The characteristics of a potassium Faraday anomalous dispersion optical filter operating on the blue and near infrared transitions are calculated. The results show that the filter can be designed to provide high transmission, very narrow pass bandwidth, and low equivalent noise bandwidth. The Faraday anomalous dispersion optical filter (FADOF) provides a narrow pass bandwidth (about GHz) optical filter for laser communications, remote sensing, and lidar. The general theoretical model for the FADOF has been established in our previous paper. In this paper, we have identified the optimum operational conditions for a potassium FADOF operating on the blue and infrared transitions. The signal transmission, bandwidth, and equivalent noise bandwidth (ENBW) are also calculated.
Using a hollow-cathode lamp (HCL) to build a Faraday anomalous dispersion optical filter (FADOF) is a new method to realize narrow linewidth optical filters. In contrast to other atomic optical filters based on saturated vapors, which work at a relatively high temperature to maintain the atomic density, the HCL device using sputtered particles can work at a much lower temperature. In this work, a rubidium HCL-based FADOF (HCL-FADOF) working at 780 nm is established and carefully tested. With 20 mm cathode length, the transmittance can reach 29% under 18 mA discharge current and 260 G magnetic field at room temperature, which is equivalent to the performance of a saturated vapor-based FADOF (VC-FADOF) at more than 60 ∘C. This work provides a direct comparison of the performance of the HCL-FADOF and the VC-FADOF, which is of great benefit to further studies of atomic filters at normal temperature.
The function and requirements of optical filter for different systems are introduced,whereby the distinctions of atomic optical filter in comparison to the traditional optical filter are presented and the development of atomic filter is summarized.Furthermore,a general model for calculating the transmittance of Faraday anomalous dispersion optical filter (FADOF) is presented,which is applicable for both passive and active working modes of FADOF.It shows that the theoretical calculation match the experimental results perfectly.Also,we report the progress on the theory and experiment research of passive and active FADOF in our group.
The function and requirements of optical filter for different systems are introduced, whereby the distinctions of atomic optical filter in comparison to the traditional optical filter are presented and the development of atomic filter is summarized. Furthermore, a general model for calculating the transmittance of Faraday anomalous dispersion optical filter (FADOF) is presented, which is applicable for both passive and active working modes of FADOF. It shows that the theoretical calculation match the experimental results perfectly. Also, we report the progress on the theory and experiment research of passive and active FADOF in our group.