Hyperfine Relaxation of Optically Pumped<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="normal">Rb</mml:mi></mml:mrow><mml:mrow><mml:mn>87</mml:mn></mml:mrow></mml:msup></mml:mrow></mml:math>Atoms in Buffer Gases

Arditi, M.; Carver, Thomas R.

doi:10.1103/physrev.136.a643

Cited by 37 publications

(19 citation statements)

References 18 publications

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“…(10) and (11), the rate of change of (S z ) for an alkali vapor with nuclear spin f would be identical to that found for the simple nuclear-spin-zero model, Eq. (5).…”

Section: A Absorption Probabilities Andmentioning

confidence: 53%

“…The effect of the extra terms in Eqs. (10) and (11) is not small. In general, the sum of these terms changes by an amount comparable to the net change in (S g ), even at low incident-light intensities and high relaxation rates.…”

Section: A Absorption Probabilities Andmentioning

confidence: 91%

“…[4][5][6][7][8][9][10][11][12][13][14][15][16] Although much experimental data is now available, theoretical calculations of the various disorientation cross sections have only recently been performed. In 1962 Bernheim 4 made the first attempt to explain the variation of the rubidium-rare-gas disorientation cross sections with rare-gas atomic number.…”

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confidence: 99%

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Relaxation Mechanisms in Optical Pumping

Franz

1966

Phys. Rev.

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The distribution of population in the ground-state sublevels of an optically pumped alkali-metal vapor has been found to be strongly dependent on the mechanisms assumed responsible for relaxation. Two modes of optical pumping zero mixing and complete mixing in the excited state, and three modes of alkali relaxation, uniform, Zeeman, and electron randomization, are considered. Calculations of the sublevel relative populations are made in terms of experimentally measurable parameters for all six combinations of pumping and relaxation modes. Optical-pumping transient signals are then used to demonstrate that alkali relaxation due to wall collisions is of the low-frequency "Zeeman" variety, while relaxation due to alkali-rare-gas collisions takes place through randomization of the spin of the alkali valence electron. Equations for the rate of change of the electronic spin polarization are derived for all cases, and are found to be nonexponential, in contrast with the case of an alkali of zero nuclear spin.

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“…(10) and (11), the rate of change of (S z ) for an alkali vapor with nuclear spin f would be identical to that found for the simple nuclear-spin-zero model, Eq. (5).…”

Section: A Absorption Probabilities Andmentioning

confidence: 53%

Section: A Absorption Probabilities Andmentioning

confidence: 91%

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Relaxation Mechanisms in Optical Pumping

Franz

1966

Phys. Rev.

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“…To transfer atom from F = 2 to F = 1 5 2 Τ are separated by ∼ 6.8 GHz. The probe laser frequency νp is detuned by δp from the F = 2 → F = 3 transition, i.e., at room temperature is of the order of milliseconds, [36] which is much longer than the above transverse transit Fig. 1(b).…”

Section: Experimental Set-up and Methodsmentioning

confidence: 99%

Measurements of spin properties of atomic systems in and out of equilibrium via noise spectroscopy

Swar¹,

Roy²,

Dhanalakshmi³

et al. 2018

Opt. Express

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We explore the applications of spin noise spectroscopy (SNS) for detection of the spin properties of atomic ensembles in and out of equilibrium. In SNS, a linearly polarized far-detuned probe beam on passing through an ensemble of atomic spins acquires the information of the spin correlations of the system which is extracted using its time-resolved Faraday-rotation noise. We measure various atomic, magnetic and sub-atomic properties as well as perform precision magnetometry using SNS in rubidium atomic vapor in thermal equilibrium. Thereafter, we manipulate the relative spin populations between different ground state hyperfine levels of rubidium by controlled optical pumping which drives the system out of equilibrium. We then apply SNS to probe such spin imbalance nonperturbatively. We further use this driven atomic vapor to demonstrate that SNS can have better resolution than typical absorption spectroscopy in detecting spectral lines in the presence of various spectral broadening mechanisms. I. INTRODUCTIONControl of spin population and its simultaneous nondestructive detection play a crucial role in diverse scientific fields such as atom interferometry [1], precision mag- netometry [2], atomic clocks [3], quantum simulation [4]and quantum information processing [5]. While external magnetic fields and optical pumping can be used to manipulate the spin polarization and population in an atomic system, spin noise spectroscopy (SNS) [6-8] provides a means of the detection of such spin coherences * mswar@rri.res.in † srishic@rri.res.in ‡ sanjukta@rri.res.in mal agitation of the electrons in an electrical conductor [9], the intensity fluctuations in the emission of random lasers [10,11] and the stochastic fluctuations in clonal cellular constituents [12,13].The optical SNS technique has been developed by Aleksandrov and Zapasskii [14] to passively probe intrinsic spin fluctuations or magnetization noise in a thermal ensemble of spins. These spin ensembles can be made of electron spins in atomic systems and spins of electrons or holes in semiconductors and other solid-state materials.A study of SNS in alkali atomic vapor of Rb and potassium (K) in thermodynamic equilibrium was carried out by [15], which indicated that the electronic and nuclear gfactors, isotope abundance ratios, nuclear moments and hyperfine splittings could be measured. The first successful application of SNS to a solid-state system was performed by [16], for measuring the electron's Lande gfactor and spin relaxation time in a n-doped GaAs semiconductor. There has been significant progress in the recent years to extend the applicability of SNS [17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32].First, we perform the SNS of Rb atoms in thermal equilibrium. We demonstrate accurate measurements of several physical quantities such as electron's g-factor, nuclear g-factor, isotope abundance ratios, and develop precision magnetometry with our thermal Rb vapor in the presence of a static magnetic field perpendicular to probe laser. While prio...

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“…The relaxation rate y x was obtained from the stimulated emission signal after the microwave pulse in a method similar to the one used by Arditi and Carver. 13 The signal amplitude immediately after the microwave pulse plotted against the time elapsed between the end of the light pulse and the rf pulse gave a direct measure of the rate y x .…”

mentioning

confidence: 99%

Stimulated Emission and Rb Spin-Exchange Cross Section

Vanier

1967

Phys. Rev. Lett.

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Hyperfine Relaxation of Optically PumpedRb87Atoms in Buffer Gases

Cited by 37 publications

References 18 publications

Relaxation Mechanisms in Optical Pumping

Relaxation Mechanisms in Optical Pumping

Measurements of spin properties of atomic systems in and out of equilibrium via noise spectroscopy

Stimulated Emission and Rb Spin-Exchange Cross Section

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