The role of hyperfine pumping in multilevel systems exhibiting saturated absorption

Smith, David A.; Hughes, Ifan G.

doi:10.1119/1.1652039

Cited by 138 publications

(112 citation statements)

References 14 publications

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“…Such resonances occur for atoms whose Doppler shifts equal half the frequency difference between transitions from different ground states. In this case hyperfine pumping [16] causes increased absorption, corresponding to an inverted feature. Since the ground state splittings of rubidium and cesium are an order of magnitude greater than for potassium, this velocity class is essentially unpopulated and ground-state crossovers are not observed.…”

Section: Introductionmentioning

confidence: 99%

Polarization spectroscopy and magnetically-induced dichroism of the potassium D_2 lines

Pahwa¹,

Mudarikwa²,

Goldwin³

2012

Opt. Express

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Abstract:We study modulation-free methods for producing sub-Doppler, dispersive line shapes for laser stabilization near the potassium D 2 transitions at 767 nm. Polarization spectroscopy is performed and a comparison is made between the use of a mirror or beam splitter for aligning the counter-propagating pump and probe beams. Conventional magneticallyinduced dichroism is found to suffer from a small dispersion and large background offset. We therefore introduce a modified scheme, using two spatially separated pump-probe beam pairs. Finally we compare our results to methods using phase modulation and heterodyne detection.

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Section: Introductionmentioning

confidence: 99%

Polarization spectroscopy and magnetically-induced dichroism of the potassium D_2 lines

Pahwa¹,

Mudarikwa²,

Goldwin³

2012

Opt. Express

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“…Nevertheless the proposed method can still provide useful information about the intensity of the trapping potentials along a certain direction because of its opto-mechanical mechanism. The second approximation is related to the two-level assumption of the N trapped identical atoms which omits also the isotope fraction [32,41] and the hyperfine level structure [55,56] which could lead to different Raman resonant relations of Eq. (3) and results in an overlap of different groups of Raman peaks.…”

Section: Discussionmentioning

confidence: 99%

Opto-mechanical estimation of micro-trap with cold atoms via nonlinear stimulated Raman scattering spectrum

Zhang

2013

Appl. Phys. B

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High-gain resonant nonlinear Raman scattering on trapped cold atoms within a high-fineness ring optical cavity is simply explained under a nonlinear opto-mechanical mechanism, and a proposal using it to detect frequency of micro-trap on atom chip is presented. The enhancement of scattering spectrum is due to a coherent Raman conversion between two different cavity modes mediated by collective vibrations of atoms through nonlinear opto-mechanical couplings. The physical conditions of this technique are roughly estimated on Rubidium atoms, and a simple quantum analysis as well as a multi-body semiclassical simulation on this nonlinear Raman process is conducted.

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“…[19,24]). When the non-cyclic F = 3 → F = 4 resonance is exited some fraction of atoms spontaneously decay from the upper F = 4 to the lower F = 4 sublevel.…”

Section: Acknowledgmentsmentioning

confidence: 99%

Improved measurement of the hyperfine structure of the laser cooling level $$4f^{12}(^3H_6)5d_{5/2}6s^2$$ 4 f 12 ( 3 H 6 ) 5 d 5 / 2 6 s 2 $$(J=9/2)$$ ( J = 9 / 2 ) in $${}^{169}_{\,\,69}{{\mathrm {Tm}}}$$ 69 169 Tm

et al. 2015

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Improved measurement of the hyperfine structure of the laser cooling level 4f 12 ( 3 H 6 )5d 5/2 6s 2 (J = 9/2) in 169 Tm We report on the improved measurement of the hyperfine structure of 4f 12 ( 3 H6)5d 5/2 6s 2 (J = 9/2) excited state in Tm-169 which is involved in the second-stage laser cooling of Tm. To measure the absolute value of the hyperfine splitting interval we used Doppler-free frequency modulation saturated absorption spectroscopy of Tm atoms in a vapor cell. The sign of the hyperfine constant was determined independently by spectroscopy of laser cooled Tm atoms. The hyperfine constant of the level equals AJ = −422.112(32) MHz that corresponds to the energy difference between two hyperfine sublevels of −2110.56(16) MHz. In relation to the saturated absorption measurement we quantitatively treat contributions of various mechanisms into the line broadening and shift. We consider power broadening in the case when Zeeman sublevels of atomic levels are taken into account. We also discuss the line broadening due to frequency modulation and relative intensities of transitions in saturated-absorption experiments.

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The role of hyperfine pumping in multilevel systems exhibiting saturated absorption

Cited by 138 publications

References 14 publications

Polarization spectroscopy and magnetically-induced dichroism of the potassium D_2 lines

Polarization spectroscopy and magnetically-induced dichroism of the potassium D_2 lines

Opto-mechanical estimation of micro-trap with cold atoms via nonlinear stimulated Raman scattering spectrum

Improved measurement of the hyperfine structure of the laser cooling level $$4f^{12}(^3H_6)5d_{5/2}6s^2$$ 4 f 12 ( 3 H 6 ) 5 d 5 / 2 6 s 2 $$(J=9/2)$$ ( J = 9 / 2 ) in $${}^{169}_{\,\,69}{{\mathrm {Tm}}}$$ 69 169 Tm

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