Verdet constant determination of dielectric media using a new versatile, portable and low-cost magneto-optical rotator

Al-Basheer, Watheq

doi:10.1088/1361-6404/ab8540

Cited by 3 publications

(3 citation statements)

References 31 publications

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“…In order to prevent the rotation of linearly polarized light caused by air from affecting the experimental results [19,20], we estimated the angle. The results showed that when the ambient magnetic field is 0.5 G and the optical path is 100 cm, the order of magnitude of the rotation angle caused by air is 10 −6• .…”

Section: Resultsmentioning

confidence: 99%

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Measurement of rubidium vapor number density based on Faraday modulator

Shang¹,

Zhou²,

Quan³

et al. 2022

J. Phys. D: Appl. Phys.

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The actual vapor density characterizing the alkali metal spin-exchange rate remains a compelling issue for spin-exchange optical pumping. Based on the deduced relationship between the Faraday rotation angle and the rubidium vapor number density using the electron dynamics theory, we report a measurement of the number density for rubidium vapor sealed inside a cell based on a Faraday modulator. The measurement relies on the optical rotation angle due to Rubidium vapor under a bias magnetic field (~0.08 T) produced by a samarium-cobalt magnet. A Faraday modulator with a lock-in amplifier is used to accurately measure the tiny optical rotation angle in a temperature range of 387~468 K. In addition, a synchronization verification is performed by the photoelastic modulator. The recurring data showed that the two methods are consistent with each other. Compared with the photoelastic modulator (PEM) method, the Faraday modulator detection system does not need to adjust the optical axis difference of 45° in the PEM detection system, thereby reducing the complexity of the experiment and the error caused by the alignment of the optical axis, which showed that the Faraday modulator detection method more advantageous in measuring the alkali metal density.

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Section: Resultsmentioning

confidence: 99%

“…The Verdet constant is an important parameter for Faraday effect, which depends on the properties of the material, temperature and λ [18]. The influence of air on the Faraday rotation of the system is also worth discussing, and it has been investigated by Al-Basheer [19] and Wu et al [20].…”

Section: Introductionmentioning

confidence: 99%

Measurement of rubidium vapor number density based on Faraday modulator

Shang¹,

Zhou²,

Quan³

et al. 2022

J. Phys. D: Appl. Phys.

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show abstract

“…Measurements of the Faraday effect and Faraday dispersion have become a staple of the undergraduate optics laboratory [27][28][29][30][31][32][33][34][35][36][37][38]. The standard technique is to use a linear polarizer after the Faraday medium to measure the rotation.…”

Section: Introductionmentioning

confidence: 99%

White-light versus discrete wavelength measurements of Faraday dispersion and the Verdet constant

2021

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The wavelength dependence of the Faraday effect may be measured either sequentially at particular wavelengths using narrow band sources, or simultaneously at many wavelengths using a white-light or broadband source. We apply both methods to measure the wavelength dependence of the Verdet constant of a terbium gallium garnet crystal. We show that although the white-light measurement offers the advantage of requiring only one source, it is more prone to systematic errors than using multiple laser sources.

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