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Dianzi xuebao

Research on the Mechanism and Performances of Anomalous Dispersion Atomic Optical Filter with Off-axis Incident Beam

Jiang Wang

Published Jan 1, 2000• 0 citations
OpenAlex

Abstract

This paper reports the theoretical study on the transmission efficiency,bandwidth and frequency shift of anomalous dispersion atomic optical filter with off axis incident beam.The experimental transmission spectrum of anomalous dispersion atomic optical filter with off axis incident beam is given in this paper,which agrees well with the theoretical result.The results will give the theoretical foundation for the use of anomalous dispersion atomic optical filter in a wide field of view acquisition approach of inter satellite or free space laser communications,which will be propitious to the pointing and acquisition in free space.

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This paper reports the theoretical study on the transmission efficiency,bandwidth and frequency shift of anomalous dispersion atomic optical filter with off axis incident beam.The experimental transmission spectrum of anomalous dispersion atomic optical filter with off axis incident beam is given in this paper,which agrees well with the theoretical result.The results will give the theoretical foundation for the use of anomalous dispersion atomic optical filter in a wide field of view acquisition approach of inter satellite or free space laser communications,which will be propitious to the pointing and acquisition in free space.
The Faraday anomalous dispersion optical filter may provide ultra-high background noise rejection for free-space laser communications systems. The theoretical model for the filter is reported. The experimental measurements and their comparison with theoretical results are discussed. The results show that the filter can provide a 56-dB solar background noise rejection with about a 2-GHz transmission bandwidth and no image degradation. To further increase the background noise rejection, a composite Zeeman and Faraday anomalous dispersion optical filter is designed and experimentally demonstrated.
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.
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.
We propose a Faraday anomalous dispersion optical filter (FADOF) based on a rare-earth ion doped crystal. We present theoretical analyses for the solid-state FADOF transmission. Our theoretical model predicts a maximum transmission efficiency of 7171%71 and a double-peaked transmission spectrum with a bandwidth of 6 GHz under current experimental conditions. Our proposal may have important applications in optical communications.
The transmission characteristics of a Raman-amplified atomic filter that can be used to detect fairly weak signals in free-space quantum-key distribution or laser communications are analyzed and discussed in the coherent and incoherent pump fields respectively. The theoretical model for the calculation of the transmission characteristics of a ground-state Raman-amplified Faraday dispersion atomic optical filter based on Raman gain and Faraday rotation is presented. The results show that the filter in a coherent pump field can achieve higher transmission and larger tunability than that in an incoherent pump field due to elimination of pumping detuning. In addition, the filter has a large scale tunability over 3.5 GHz via the Faraday transmission peak adjusted while its bandwidth is only 66 MHz, which is useful for free-space laser communication and lidar systems.
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.