Nuclear magnetic resonance gyroscopes

Donley, Elizabeth A.

doi:10.1017/cbo9780511846380.020

Cited by 10 publications

(6 citation statements)

References 51 publications

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“…59,62,63 Several reviews of NMR gyroscopes have been published previously. [63][64][65][66][67] A key ingredient to the successful implementation of an NMR gyro design is the comagnetometer. Because magnetic fields shift the spin resonance frequency of a single atomic species in a manner similar to rotations, fluctuations in magnetic field cause corresponding fluctuations in the apparent rotation rate.…”

Section: E Vapor Cell Nmr Gyroscopesmentioning

confidence: 99%

Chip-scale atomic devices

Kitching

2018

Applied Physics Reviews

428

175

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Section: E Vapor Cell Nmr Gyroscopesmentioning

confidence: 99%

Chip-scale atomic devices

Kitching

2018

Applied Physics Reviews

428

175

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“…Dx, 06.30.Gv, 39.90.+d Spin comagnetometers first introduced in [1] are used for several types of fundamental physics experiments, such as tests of Lorentz, CP and CPT symmetries [2][3][4][5] and searches for spin-dependent forces [6][7][8][9][10]. They also have practical applications as inertial rotation sensors [11][12][13][14][15][16]. When two different spin ensembles occupy the same volume they experience nearly the same average magnetic field [17].…”

mentioning

confidence: 99%

He3−Xe129 Comagnetometery using
Limes
¹
,
Sheng
²
,
Romalis
³

2018
Phys. Rev. Lett.
125
2
81
0
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We describe a 3 He-129 Xe comagnetometer using 87 Rb atoms for noble-gas spin polarization and detection. We use a train of 87 Rb π pulses and σ + /σ − optical pumping to realize a finite-field Rb magnetometer with suppression of spin-exchange relaxation. We suppress frequency shifts from polarized Rb by measuring the 3 He and 129 Xe spin precession frequencies in the dark, while applying π pulses along two directions to depolarize Rb atoms. The plane of the π pulses is rotated to suppress the Bloch-Siegert shifts for the nuclear spins. We measure the ratio of 3 He to 129 Xe spin precession frequencies with sufficient absolute accuracy to resolve the Earth's rotation without changing the orientation of the comagnetometer. A frequency resolution of 7 nHz is achieved after integration for 8 hours without evidence of significant drift.PACS numbers: 32.30. Dx, 06.30.Gv, 39.90.+d Spin comagnetometers first introduced in [1] are used for several types of fundamental physics experiments, such as tests of Lorentz, CP and CPT symmetries [2][3][4][5] and searches for spin-dependent forces [6][7][8][9][10]. They also have practical applications as inertial rotation sensors [11][12][13][14][15][16]. When two different spin ensembles occupy the same volume they experience nearly the same average magnetic field [17]. The ratio of their spin precession frequencies f r = ω He /ω Xe can then be used to measure the inertial rotation rate Ω or a spin coupling beyond the Standard Model b:( 1) where B 0 is the bias field alongẑ and γ He , γ Xe are the gyromagnetic ratios for 3 He and 129 Xe, which are well known [18]. Since I = 1/2 nuclear spins are free from quadrupolar energy shifts [19], f r provides an absolute measure of non-magnetic spin interactions-this is particularly important in searches for spin-gravity coupling [20] (where the interaction is hard to modulate), and for use as a gyroscope.An alkali-metal magnetometer provides a natural way to detect nuclear-spin signals because Rb atoms are already used to polarize the nuclear spins by spin-exchange collisions; these collisions enhance the classical dipolar field from the nuclear magnetization by a factor κ 0 [21], which is about 5 for Rb-3 He [22] and 500 for Rb-Xe [23]. However, the presence of polarized Rb atoms also causes large noble-gas frequency shifts that affect the accuracy of Eq. (1). In the past, these frequency shifts have been avoided in 3 He-129 Xe comagnetometers by detecting a smaller dipolar field outside of an alkali-free cell using an RF coil [24] or a SQUID magnetometer [25].In this Letter we describe a new method for operating the 3 He-129 Xe comagnetometer using 87 Rb readout with high sensitivity and accuracy. We develop a 87 Rb magnetometer that can operate in a finite magnetic field of about 5 mG while suppressing Rb-Rb spin-exchange relaxation to increase the magnetometer sensitivity. It

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“…Показано, что сравнительно небольшое число лазеров позволяет в режиме СВЧ-модуляции получить спектр, требуемый для атомных часов на основе эффекта когерентного пленения населенностей. Атомы щелочных металлов (прежде всего цезия, рубидия и калия) находят широкое применение в метрологии частоты и времени [1], магнитометрии [2] и гироскопии [3,4].…”

Section: поступило в редакцию 30 августа 2017 гunclassified

Спектрально-Модуляционные Характеристики Лазеров С Вертикальным Резонатором

Васьковская¹,

Васильев²,

Зибров³

et al. 2018

Письма В Журнал Технической Физики

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Рассмотрены требования, предъявляемые к лазерам с вертикальным ре-зонатором, в ряде задач метрологии, где используется оптическая накачка атомов щелочных металлов. Для лазеров различных производителей эти требования сопоставлены с экспериментально наблюдаемыми спектральными характеристиками при постоянном токе накачки и в режиме его модуляции СВЧ-сигналом. Показано, что сравнительно небольшое число лазеров позволяет в режиме СВЧ-модуляции получить спектр, требуемый для атомных часов на основе эффекта когерентного пленения населенностей.

show abstract

Nuclear magnetic resonance gyroscopes

Cited by 10 publications

References 51 publications

Chip-scale atomic devices

Chip-scale atomic devices

He3−Xe129 Comagnetometery using
Limes
¹
,
Sheng
²
,
Romalis
³

2018
Phys. Rev. Lett.
125
2
81
0
View full text Add to dashboard Cite

Спектрально-Модуляционные Характеристики Лазеров С Вертикальным Резонатором

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Nuclear magnetic resonance gyroscopes

Cited by 10 publications

References 51 publications

Chip-scale atomic devices

Chip-scale atomic devices

He3−Xe129 Comagnetometery using Limes1, Sheng2, Romalis3 2018Phys. Rev. Lett.1252810View full textAdd to dashboardCite

Спектрально-Модуляционные Характеристики Лазеров С Вертикальным Резонатором

Contact Info

Product

Resources

About

He3−Xe129 Comagnetometery using
Limes
¹
,
Sheng
²
,
Romalis
³

2018
Phys. Rev. Lett.
125
2
81
0
View full text Add to dashboard Cite