Generalized theory of double-resonance optical pumping of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mmultiscripts><mml:mi mathvariant="normal">He</mml:mi><mml:mprescripts /><mml:none /><mml:mrow><mml:mn>4</mml:mn></mml:mrow></mml:mmultiscripts></mml:math>

Plante, Michael K.; MacFarlane, Duncan L.; McGregor, Douglas D.; Slocum, Robert E.; Sampson, William M.; Brown, A.H.

doi:10.1103/physreva.82.013837

Cited by 21 publications

(7 citation statements)

References 24 publications

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“…where I(z 0 ) is the initial light intensity incident on ∆z, n is the numbers density of the metastable 4 He atoms, Q A is the absorption cross section, Q M is the (dichroic) monitoring cross section, J z is the polarization in the volume element [12,27]. The optical absorption of the polarized 4 He atoms in the cell gradually weakens along the light-propagation direction z.…”

Section: Theoretical Analysis and Simulationmentioning

confidence: 99%

A Compact Laser Pumped 4He Magnetometer with Laser-Frequency Stabilization by Inhomogeneous Light Shifts

Wang

et al. 2020

Applied Sciences

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We propose a compact 4He magnetometer realizing magnetic field measurement and laser-frequency stabilization simultaneously in a single 4He atomic cell. The frequency stabilization scheme is based on the asymmetric line shape of magnetic resonance which is induced by spatially inhomogeneous light shifts. We investigate the asymmetric line shape of the magnetic resonance signal theoretically and experimentally in laser pumped 4He magnetometer with the magneto-optical double-resonance configuration. Notice that, due to the asymmetric line shape, the in-phase component of the magnetic resonance signal is shown to have a linear dependence with respect to the laser frequency detuning and is used to actively lock the laser frequency to the resonant point. The method reduces the complexity of the system and improves the stability of the magnetometer, making the laser-pumped 4He magnetometer more compact and portable.

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Section: Theoretical Analysis and Simulationmentioning

confidence: 99%

A Compact Laser Pumped 4He Magnetometer with Laser-Frequency Stabilization by Inhomogeneous Light Shifts

Wang

et al. 2020

Applied Sciences

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“…Helmholtz coil were used to apply alternating magnetic fields to 4 He atoms. When the frequency of the alternating magnetic fields is equal to the Larmor frequency, NMR occurs and the depolarization process is induced [15][16][17]. In the process of depolarization, transition between adjacent energy levels causes the magnetic moment of atoms to lose its orientation, as shown in Fig.…”

Section: A Operating Principle and Sensitivity Of Optically Pumped Magnetic Field Sensormentioning

confidence: 99%

“…In (15), K1 is gyromagnetic ratio, K1=28.02356, K2 is coefficient of photoelectric to voltage, K2=0.9×190×1000, K3 is magnification of pre-amplifier and filter, K3=10×510×5, K4 and K5 are amplification of AD convertor and phase-locked amplifier, respectively, K4=2 18 /5, K5= 1.3563×1.8118. K6 andK7 are coefficient of frequency modulator and coils-control circuit, respectively, K6=(14000×2π×10)/(49999872×2 48 ), K7=12/3.3.…”

Section:       -1 1 2 3 4 -3 2 3 4 5 6 K K K K Z D Z H Z = 1 + K K K K K Z D Z (15)mentioning

confidence: 99%

A Magnetic Field Gradiometer based on the Laser Helium Optically Pumped Magnetic Field Sensors

2020

International Journal of Circuits, Systems and Signal Processing

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The theory of ows is one of the most important parts of Combinatorial Optimiza- tion and it has various applications. In this pa- per we study optimum (maximum or minimum) ows in directed bipartite dynamic network and is an extension of article [9]. In practical situa- tions, it is easy to see many time-varying opti- mum problems. In these instances, to account properly for the evolution of the underlying sys- tem overtime, we need to use dynamic network ow models. When the time is considered as a variable discrete values, these problems can be solved by constructing an equivalent, static time expanded network. This is a static approach

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“…As mentioned above, 4 He atomic energy level transition between the meta-state and excited-state obtain energy through the absorption of light in the certain wavelengths [11]. Because of optical pumping action, there are three transitions during wavelength range of 1083.1 nm around to 1083.3 nm around, form the transition line D 0 , D 1 and D 2 , respectively [12]. Part of the light and electrical signal curve changing with time during the voltage scanning process can be showed in Figure 3.…”

Section: S353mentioning

confidence: 99%

Research on the signal of 4He pump magnetometer sensor using ECDL laser

Wang¹,

Zhou²,

Cheng³

2018

biomedicalresearch

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One of the most important factors determines specifications of 4 He optically pumped magnetometer is the quality of resonance signal given by sensor probe. This paper introduces a laser 4 He optically pumped magnetometer using an ECDL laser. An external cavity length tuning system of ECDL laser based on the double light path atom saturated absorption spectrum method with a 4 He cell is build up to ensure that an effective 1083.207 nm laser light source is provided for the magnetometer probe. It is designed a double path photoelectric detector to get the absorption peak signal by the difference technology. Because signal in accordance with Lorentz linear features, a detection method combined with first and second derivative of signal curve is proposed. Join a modulation signal whose form is dc component add sinusoidal component, the system make ECDL laser give a stable output wavelength around 1083.207 nm. With the laser light, a resonance signal with better quality than the 4 He optically pumped magnetometer probe using the gas discharge lamp light source is given.

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Generalized theory of double-resonance optical pumping ofHe4

Cited by 21 publications

References 24 publications

A Compact Laser Pumped 4He Magnetometer with Laser-Frequency Stabilization by Inhomogeneous Light Shifts

A Compact Laser Pumped 4He Magnetometer with Laser-Frequency Stabilization by Inhomogeneous Light Shifts

A Magnetic Field Gradiometer based on the Laser Helium Optically Pumped Magnetic Field Sensors

Research on the signal of 4He pump magnetometer sensor using ECDL laser

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