Faraday anomalous dispersion optical filter at ^133Cs weak 459  nm transition

Xue, Xiaobo; Pan, Duo; Zhang, Xiaogang; Luo, Bin; Chen, Jingbiao; Guo, Hong

doi:10.1364/prj.3.000275

Cited by 12 publications

(7 citation statements)

References 25 publications

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“…[18][19][20] At present, many Faraday filters have been realized based on the transitions between the ground state and the excited state in the experiments. [21][22][23] They have high transmittance because the atoms are usually populated on the ground state, but the selectable working wavelength is restricted by a limited number of transition lines from ground state. For having more choices of working wavelengths, the excited state Faraday anomalous dispersion optical filter (ES-FADOF) becomes the focus of research, [24][25][26] but it is still a challenge for the realization of high transmittance, because the ES-FADOF requires that the atoms can be effectively populated to the intermediate excited state from the ground state.…”

Section: Introductionmentioning

confidence: 99%

Demonstration of Faraday anomalous dispersion optical filter with reflection configuration

Liu¹,

Yang²,

Wang³

et al. 2022

Chinese Phys. B

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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.

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Section: Introductionmentioning

confidence: 99%

Demonstration of Faraday anomalous dispersion optical filter with reflection configuration

Liu¹,

Yang²,

Wang³

et al. 2022

Chinese Phys. B

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show abstract

“…Up to now, the FADOFs have been realized on different atomic transitions, mostly with transmittance between 40% and 100%, and equivalent noise bandwith (ENBW) around 1 GHz, such as Na 589 nm (90%, 5 GHz) 18 , Rb 780 nm (83%, 2.6 GHz) 19 , Rb 795 nm (70%, 1.2 GHz) 20 , Cs 459 nm (98%, 1.2 GHz) 21 , Cs 852 nm (88%, 0.56 GHz) 22 , Cs 894 nm (77%, 0.96 GHz) 23 , Sr 461 nm (63%, 1.19 GHz) 24 , etc 25 – 28 . An ultra-narrow optical filter based on Faraday effect has been demonstrated in 2012 29 , of which the bandwidth is 6.2 MHz.…”

Section: Introductionmentioning

confidence: 99%

Atomic optical stimulated amplifier with optical filtering of ultra-narrow bandwidth

Pan

Shi

Luo

et al. 2018

Sci Rep

Self Cite

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Taking advantages of ultra-narrow bandwidth and high noise rejection performance of the Faraday anomalous dispersion optical filter (FADOF), simultaneously with the coherent amplification of atomic stimulated emission, we propose a stimulated amplified Faraday anomalous dispersion optical filter (SAFADOF) at cesium 1470 nm. The SAFADOF is able to significantly amplify very weak laser signals and reject noise in order to obtain clean signals in strong background. We show that for a weak signal of 50 pW, the gain factor can be larger than 25000 (44 dB) within a bandwidth as narrow as 13 MHz. Having the ability to amplify weak signals with low background contribution, the SAFADOF finds outstanding potential applications in weak signal detections.

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“…The underwater environment is one of the most challenging conditions for object detection. The signal received by any sensor can be significantly absorbed and distorted by the water medium [ 1 ]. This significantly degrades the performance of object detection methods, leading to high false positive and false negative ratios.…”

Section: Introductionmentioning

confidence: 99%

Monocular Vision-Based Underwater Object Detection

Chen

Zhang

Dai

et al. 2017

Sensors

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In this paper, we propose an underwater object detection method using monocular vision sensors. In addition to commonly used visual features such as color and intensity, we investigate the potential of underwater object detection using light transmission information. The global contrast of various features is used to initially identify the region of interest (ROI), which is then filtered by the image segmentation method, producing the final underwater object detection results. We test the performance of our method with diverse underwater datasets. Samples of the datasets are acquired by a monocular camera with different qualities (such as resolution and focal length) and setups (viewing distance, viewing angle, and optical environment). It is demonstrated that our ROI detection method is necessary and can largely remove the background noise and significantly increase the accuracy of our underwater object detection method.

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Faraday anomalous dispersion optical filter at ^133Cs weak 459 nm transition

Cited by 12 publications

References 25 publications

Demonstration of Faraday anomalous dispersion optical filter with reflection configuration

Demonstration of Faraday anomalous dispersion optical filter with reflection configuration

Atomic optical stimulated amplifier with optical filtering of ultra-narrow bandwidth

Monocular Vision-Based Underwater Object Detection

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