Progress towards fundamental symmetry tests with nonlinear optical rotation

Kimball, Derek F. Jackson; Budker, Dmitry; English, D.; Li, C.-H.; Nguyen, Angela-Maithy; Rochester, Simon; Sushkov, Alexander O.; Yashchuk, Valeriy V.; Zolotorev, M.

doi:10.1063/1.1426796

Cited by 7 publications

(4 citation statements)

References 47 publications

(82 reference statements)

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“…Since the width of the NMOR resonance depends on magnetic-field inhomogeneities [12], we hope to reduce it below 10 µG with better shielding and by using compensation coils. Indeed, widths of the zero-field NMOR resonance of order 2 µG have been observed using a four-layer shield [3]. However, even with our width of 85 µG, the shotnoise-limited sensitivity to a measurement of the magnetic field is δB = 0.15 nG/ √ Hz.…”

Section: -P2mentioning

confidence: 73%

“…The effect is nonlinear because the degree of optical alignment is dependent on the light intensity. NMOR in atomic vapor allows optical detection of zero-field level crossings in the shot noise limit, and has important applications in sensitive magnetometry [1,2], search for a permanent electric dipole moment (EDM) [3], and magnetic resonance imaging (MRI) [4].…”

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confidence: 99%

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Chopped nonlinear magneto-optic rotation: A technique for precision measurements

Ravishankar¹,

Chanu²,

Natarajan³

2011

EPL

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Magnetooptical and electrooptical spectra and effects PACS 32.80.Xx -Level crossing and optical pumping PACS 42.50.Gy -Effects of atomic coherence on propagation, absorption, and amplification of light; electromagnetically induced transparency and absorption PACS 32.10.Dk -Electric and magnetic moments, polarizabilitiesAbstract. -We have developed a technique for precise measurement of small magnetic fields using nonlinear magneto-optic rotation (NMOR). The technique relies on the resonant laser beam being chopped. During the on time, the atoms are optically pumped into an aligned ground state (∆m = 2 coherence). During the off time, they freely precess around the magnetic field at the Larmor frequency. If the on-off modulation frequency matches (twice) the Larmor precession frequency, the rotation is resonantly enhanced in every cycle, thereby making the process like a repeated Ramsey measurement of the Larmor frequency. We study chopped-NMOR in a paraffincoated Cs vapor cell. The out-of-phase demodulated rotation shows a Lorentzian peak of linewidth 85 µG, corresponding to a sensitivity of 0.15 nG/ √ Hz. We discuss the potential of this technique for the measurement of an atomic electric-dipole moment.

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Section: -P2mentioning

confidence: 73%

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confidence: 99%

Chopped nonlinear magneto-optic rotation: A technique for precision measurements

Ravishankar¹,

Chanu²,

Natarajan³

2011

EPL

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“…In an optically active medium, the velocities of left and right circularly polarized light are different [64]. Figure 2 shows that when linearly polarized light propagates through a medium with glucose molecules, the plane of light polarization at the output can be rotated [32]. In a clear medium, the amount of optical rotation 𝛼, which is linearly proportional to the glucose concentration 𝐶, can be computed with following equation [71]:…”

Section: Background and Challengesmentioning

confidence: 99%

Noninvasive glucose monitoring using polarized light

Bai

Prioleau

et al. 2020

Proceedings of the 18th Conference on Embedded Networked Sensor Systems

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We propose a compact noninvasive glucose monitoring system using polarized light, where a user simply needs to place her palm on the device for measuring her current glucose concentration level. The primary innovation of our system is the ability to minimize light scattering from the skin and extract weak changes in light polarization to estimate glucose concentration, all using lowcost hardware. Our system exploits multiple wavelengths and light intensity levels to mitigate the effect of user diversity and confounding factors (e.g., collagen and elastin in the dermis). It then infers glucose concentration using a generic learning model, thus no additional calibration is needed. We design and fabricate a compact (17 cm × 10 cm × 5 cm) and low-cost (i.e., <$250) prototype using off-the-shelf hardware. We evaluate our system with 41 diabetic patients and 9 healthy participants. In comparison to a continuous glucose monitor approved by U.S. Food and Drug Administration (FDA), 89% of our results are within zone A (clinically accurate) of the Clarke Error Grid. The absolute relative difference (ARD) is 10% . The 𝑟 and 𝑝 values of the Pearson correlation coefficients between our predicted glucose concentration and reference glucose concentration are 0.91 and 1.6 × 10 −143 , respectively. These errors are comparable with FDA-approved glucose sensors, which achieve ≈90% clinical accuracy with a 10% mean ARD. CCS CONCEPTS• Human-centered computing → Ubiquitous and mobile computing; • Hardware → Sensor devices and platforms.

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“…An interesting area of application of NMOR is fundamental research. For example, the effect is used in the search for non-magnetic spin couplings [15][16][17][18][19], and is proposed for experiments focusing on the detection of constituents of dark matter/energy [20].…”

Section: Introductionmentioning

confidence: 99%

Nonlinear magneto-optical rotation in rubidium vapor excited with blue light

et al. 2015

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We present experimental and numerical studies of nonlinear magneto-optical rotation (NMOR) in rubidium vapor excited with resonant light tuned to the 5 2 S 1/2 → 6 2 P 1/2 absorption line (421 nm). Contrary to the experiments performed to date on the strong D1 or D2 lines, in this case, the spontaneous decay of the excited state 6 (2009), we demonstrate that despite the complexity of the structure, NMOR can be adequately described with a model, where only a single excited-state relaxation rate is used.

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Progress towards fundamental symmetry tests with nonlinear optical rotation

Cited by 7 publications

References 47 publications

Chopped nonlinear magneto-optic rotation: A technique for precision measurements

Chopped nonlinear magneto-optic rotation: A technique for precision measurements

Noninvasive glucose monitoring using polarized light

Nonlinear magneto-optical rotation in rubidium vapor excited with blue light

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