Motion-selective coherent population trapping for subrecoil cooling of optically trapped atoms outside the Lamb-Dicke regime

Lee, Hyun Gyung; Park, Soo‐Young; Seo, Meung Ho; Cho, D.

doi:10.1103/physreva.106.023324

Cited by 6 publications

(4 citation statements)

References 16 publications

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“…While the condition is well satisfied along tightly confined directions in an optical lattice or an optical tweezer, it is difficult to satisfy the condition in a typical optical trap. To improve the effectiveness of RSC outside the Lamb-Dicke regime, we proposed to incorporate the phenomenon of coherent population trapping (CPT) to RSC [8]. Figure 8 shows the inverted Y configuration for the cooling scheme.…”

Section: Motion-selective Coherent Population Trappingmentioning

confidence: 99%

“…We call it magic well depth [7]. Finally, we describe a cooling method that we call motion-selective coherent population trapping [8,9]. In this method, the ideas of Raman sideband cooling and velocity-selective coherent population trapping are combined to complement each other, and vector polarizability plays a pivotal role in producing motion-selectivity.…”

Section: Introductionmentioning

confidence: 99%

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A Study on the Interaction of Apartment Price and Transaction Volumein Seoul

Cho¹,

Kim²

2020

Korea Real Estate Academy

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We review a few ideas and experiments that our laboratory at Korea University has proposed and carried out to use vector polarizability β to manipulate alkali-metal atoms. β comes from spin-orbit coupling, and it produces an ac Stark shift that resembles a Zeeman shift. When a circularly polarized laser field is properly detuned between the D 1 and D 2 transitions, an ac Stark shift of a ground-state atom takes the form of a pure Zeeman shift. We call it the "analogous Zeeman effect", and experimentally demonstrated an optical Stern-Gerlach effect and an optical trap that behaves exactly like a magnetic trap. By tuning polarization of a trapping beam, and thereby controlling a shift proportional to β, we demonstrated elimination of an inhomogeneous broadening of a ground hyperfine transition in an optical trap. We call it "magic polarization".We also showed significant narrowing of a Raman sideband transition at a specific well depth. A Raman sideband in an optical trap is broadened owing to anharmonicity of the trap potential, and the broadening can be eliminated by a β-induced differential ac Stark shift at what we call a "magic well depth". Finally, we proposed and experimentally demonstrated a cooling scheme that incorporated the idea of velocity-selective coherent population trapping to Raman sideband cooling to enhance cooling efficiency of the latter outside of the Lamb-Dicke regime. We call it "motionselective coherent population trapping", and β is responsible for the selectivity. We include as Supplementary Material a program file that calculates both scalar and vector polarizabilities of a given alkali-metal atom when the wavelength of an applied field is specified. It also calculates depth of a potential well and photon-scattering rate of a trapped atom in a specific ground state when power, minimum spot size, and polarization of a trap beam are given.

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Section: Motion-selective Coherent Population Trappingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Study on the Interaction of Apartment Price and Transaction Volumein Seoul

Cho¹,

Kim²

2020

Korea Real Estate Academy

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“…These probes of velocity selective optical pumping (VSOP) may be of interest in different areas of current research. VSOP has been used in the development of room-temperature quantum memories [33,34] or in experiments that use motion-selective coherent population trapping [35] to achieve subrecoil cooling in atomic samples [36,37]. VSOP is used to study hyperfine optical pumping effects of thermal rubidium atoms probed by an evanescent electromagnetic field [38] and in surface plasmon resonance (SPR) experiments [39].…”

Section: Introductionmentioning

confidence: 99%

Study of the velocity-selection satellites present in the 5P3/2→6PJ ( J=1/2, 3/2 ) electric quadrupole transitions in atomic rubidium

Ponciano-Ojeda,

Mojica-Casique,

Hoyos-Campo

et al. 2023

J. Phys. B: At. Mol. Opt. Phys.

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This article presents detailed experimental and theoretical studies of the satellite fluorescence lines observed when the $5P_{3/2} \to 6P_J $, ($J = 1/2 $, $3/2$) electric quadrupole transition (E2) is excited in a room temperature vapor of rubidium atoms.The initial state of this E2 transition is prepared by a narrow linewidth \jjm{($9 $ MHz)} laser locked to one of the dominant $5S_{1/2} \to 5P_{3/2} $ D2 hyperfine excitations for zero-velocity atoms.Effects due to the selection of different atomic velocity classes in this preparation step are responsible for the presence of several satellite lines that can be found in the fluorescence decay spectra of both $^{85}$Rb and $^{87}$Rb.Compared to the main lines, these satellites do not show a strong dependence on the relative linear polarization directions of the lasers used in the preparation and the electric quadrupole steps.The relative intensities of the satellites decrease as the intensity of the preparation laser increases.Results of a rate equation calculation that explicitly includes selection-of-velocity effects indicate that optical pumping plays a central role in determining the relative intensities and the polarization dependence of the satellite lines.When the preparation laser is locked to the $5S_{1/2} \ F_1 = 1 \to 5P_{3/2} \ F_2 = 0$ {\it low-$F$} cyclic transition in $^{87}$Rb, six lines were found in addition to the $5P_{3/2} \ F_2 = 0 \to 6P_{3/2} \ F_3 = 2 $ lone electric quadrupole transition for zero velocity atoms.In this case, the calculated spectrum is necessary for the correct interpretation of the experimental results, clearly indicating that optical pumping and selection of velocities are responsible for these six additional electric quadrupole lines.

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