Building a 3.5 m prototype interferometer for the Q&amp;A vacuum birefringence experiment and high-precision ellipsometry

Wu, Jeah-Sheng; Ni, Wei-Tou; Chen, Sheng-Jui

doi:10.1088/0264-9381/21/5/130

Cited by 16 publications

(12 citation statements)

References 8 publications

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“…If one of the two ellipticities is static, one has a homodyne detection. Following the guidelines of the 1979 paper, several experimental efforts have been set up in the attempt to measure the tiny vacuum magnetic birefringence [30][31][32][34][35][36][37][38][39][40][41][42][43][44][45], without success. The modulation of the effect can be obtained either by varying the magnetic field intensity or its direction.…”

Section: Modulation Polarimetrymentioning

confidence: 99%

Polarimetry for measuring the vacuum magnetic birefringence with quasi-static fields: a systematics study for the VMB@CERN experiment

et al. 2022

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We present an experimental systematics study of a polarimetric method for measuring the vacuum magnetic birefringence based on a pair of rotating half-wave plates. The presence of a systematic effect at the same frequency as the sought for magneto-optical effect inhibits the use of strictly constant magnetic fields. We characterise this systematic, discuss its origin and propose a viable workaround.

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Section: Modulation Polarimetrymentioning

confidence: 99%

Polarimetry for measuring the vacuum magnetic birefringence with quasi-static fields: a systematics study for the VMB@CERN experiment

et al. 2022

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“…The sign distinguishes between the two rotation directions of the electric field around the ellipse. the attempt to measure the tiny vacuum magnetic birefringence [26][27][28][30][31][32][33][34][35][36][37][38][39][40][41], without success. The modulation of the effect can be obtained either by varying the magnetic field intensity or its direction.…”

Section: Modulation Polarimetrymentioning

confidence: 99%

Polarimetry for measuring the vacuum magnetic birefringence with quasi-static fields: a systematics study for the VMB@CERN experiment

Zavattini,

Della Valle,

Soflau

et al. 2021

Preprint

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We present an experimental feasibility study of the polarimetric method for measuring the vacuum magnetic birefringence based on a pair of rotating half-wave plates. The presence of a systematic effect at the same frequency as the sought for magneto-optical effect inhibits the use of strictly constant magnetic fields. We characterise this systematic, discuss its origin and propose a viable workaround. Physics backgroundClassical Electrodynamics in vacuum is a linear theory in which the superposition principle holds. In vacuum, in the absence of sources, Maxwell's equations allow wave propagation with velocity 𝑐 = 1/ √ 𝜖 0 𝜇 0 . However, almost a century ago the classical theory of radiation was radically modified by Dirac's relativistic wave equation of the electron [1], which brought along an infinite number of states of negative energy. These states, according to Pauli's principle, are occupied by an infinite number of electrons forming an undetectable background. An electron in a negative energy state could absorb a quantum of light and manifest itself as a real positive-energy electron, leaving behind a "hole" in the background; a hole that (before the discovery of the positron) was recognised to play the role of an "anti-electron" [2]. It was also noted that the energy conservation law could be violated in the short-lived "intermediate state" before the annihilation of the particle/anti-particle pair and the reappearance of the quantum of light [3]: vacuum fluctuations were hence possible. In this picture it was no longer "possible to separate processes in the vacuum from those involving matter since electromagnetic fields can create matter if they are strong enough. Even if they are not strong enough to

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“…[2][3][4] Le Grand and Le Floch 5 proposed helicoidal waves propagating in the Fabry-Pérot cavity for small Faraday rotation measurement. Once an external magnetic field which is coaxial to a linear polarized laser beam is applied on specimen, the linear polarization is rotated because of the Faraday effect of specimen.…”

Section: High Sensitivity Two-frequency Paired Polarized Interferometmentioning

confidence: 99%

High sensitivity two-frequency paired polarized interferometer in Faraday rotation angle measurement of ambient air with single-traveling configuration

Lin

et al. 2008

Journal of Applied Physics

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Articles you may be interested inDiagnosing collisions of magnetized, high energy density plasma flows using a combination of collective Thomson scattering, Faraday rotation, and interferometry (invited)a) Rev. Sci. Instrum. 85, 11E502 (2014); 10.1063/1.4890564 High-frequency fluctuation measurements by far-infrared laser Faraday-effect polarimetry-interferometry and forward scattering system on MSTa) Rev. Sci. Instrum. 85, 11D406 (2014); 10.1063/1.4889909 Simultaneous measurement of circular dichroism and Faraday rotation at terahertz frequencies utilizing electric field sensitive detection via polarization modulation Rev. Sci. Instrum. 81, 083903 (2010); 10.1063/1.3480554 Simultaneous Cotton-Mouton and Faraday rotation angle measurements on JET Rev. Sci. Instrum. 77, 10F324 (2006); 10.1063/1.2229169High sensitivity Faraday rotation technique for measurements of magnetic fields with immunity to x-ray effects Rev.High sensitivity detection on Faraday rotation and Verdet constant of ambient air under weak applied magnet field and single-pass configuration specimen is setup in which a two-frequency paired linear polarized interferometer ͑TPPI͒ coupled with balanced detector shown at shot-noise-limited detection is demonstrated. The Verdet constant of ambient air at 1.3 ϫ 10 −6 rad/ mT m and its sensitivity at 4.3ϫ 10 −8 rad/ mT m were measured. Additionally, this method also is able to extend into a broad spectral range on Faraday rotation angle or Verdet constant measurement. Finally, the enhancement on detection sensitivity by integrating a Fabry-Pérot cavity into TPPI is discussed.

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Building a 3.5 m prototype interferometer for the Q&A vacuum birefringence experiment and high-precision ellipsometry

Cited by 16 publications

References 8 publications

Polarimetry for measuring the vacuum magnetic birefringence with quasi-static fields: a systematics study for the VMB@CERN experiment

Polarimetry for measuring the vacuum magnetic birefringence with quasi-static fields: a systematics study for the VMB@CERN experiment

Polarimetry for measuring the vacuum magnetic birefringence with quasi-static fields: a systematics study for the VMB@CERN experiment

High sensitivity two-frequency paired polarized interferometer in Faraday rotation angle measurement of ambient air with single-traveling configuration

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