Optimal geometry for efficient loading of an optical dipole trap

Szczepkowicz, Andrzej; Krzemień, Leszek; Wojciechowski, Adam; Brzozowski, Krzysztof; Krüger, Michael; Zawada, M.; Witkowski, Marcin; Zachorowski, Jerzy; Gawlik, Wojciech

doi:10.1103/physreva.79.013408

Cited by 5 publications

(9 citation statements)

References 14 publications

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“…7. It has been pointed out earlier [15] that the potential surface is an ellipsoidal surface with larger area away from focal position. Kuppens et al [6] suggested that initial loading rate of ODT is proportional to the effective surface area of ODT.…”

Section: B Effective Absorption Cross-section and Optical Densitymentioning

confidence: 90%

“…Kuppens et al [6] suggested that initial loading rate of ODT is proportional to the effective surface area of ODT. In view of this, it can be beneficial for ODT loading to align dipole trap beam on the MOT such that MOT position was slightly shifted from focal position of the ODT beam [15]. In order to correctly estimate the number atoms (N) trapped in ODT, the effective absorption cross-section σ ef f calculated after knowing position and intensity dependent AC-Stark shift has been used in the analysis of experimentally observed absorption images of the trapped atom cloud.…”

Section: B Effective Absorption Cross-section and Optical Densitymentioning

confidence: 99%

“…1) to image the atom cloud in dipole trap. The process and control sequence [4,6,[14][15][16] for loading the dipole trap is shown in Fig. 2.…”

Section: Introductionmentioning

confidence: 99%

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Effect of AC-Stark shift in optical dipole trap on absorption imaging of trapped atoms

Bhardwaj,

Ram,

Singh

et al. 2020

Preprint

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In the present work, the effect of AC-Stark shift (i.e. light-shift) in optical dipole trap on in-situ absorption probe imaging of the trapped atoms has been investigated. We have calculated the light-shift of various energy levels of 87 Rb atoms relevant for trapping in an optical dipole trap (ODT). The spatial varying intensity of the ODT beam results in position dependent light-shift (i.e. AC-Stark shift). Such modifications in the energy levels of the atom result in modification in the absorption cross-section, which finally modifies the optical density (OD) in in-situ absorption imaging at a given wavelength of imaging probe beam. Incorporating the light-shift in analysis of images, the correct number of atoms in the optical dipole trap has been estimated for the experimentally observed absorption images of the trapped cloud. The in-situ imaging and this work can be useful in estimating the instantaneous loss rate from the trap during the evaporative cooling of trapped atom cloud.

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Section: B Effective Absorption Cross-section and Optical Densitymentioning

confidence: 90%

Section: B Effective Absorption Cross-section and Optical Densitymentioning

confidence: 99%

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Effect of AC-Stark shift in optical dipole trap on absorption imaging of trapped atoms

Bhardwaj,

Ram,

Singh

et al. 2020

Preprint

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“…The applications of the researches in the FORT mainly involve the use of the dipole forces, called as optical dipole force trap. Moreover, although the near-optical resonant trap (NORT), which has a small detuning round of several tens of GHz to several THz, has been treated with * Electronic address: tojo@phys.chuo-u.ac.jp experimental difficulties because of heating, scattering, and dephasing beyond their perturbative conditions by the spontaneous emission [16,17], there is a possibility of using not only the dipole force but also the radiative force as the hybrid force trap.…”

Section: Introductionmentioning

confidence: 99%

Effective trapping of cold atoms using dipole and radiative forces in an optical trap

Mashimo¹,

Abe²,

Tojo³

2019

Phys. Rev. A

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We report on highly effective trapping of cold atoms by a new method for a stable single optical trap in the near-optical resonant regime. An optical trap with the near-optical resonance condition consists of not only the dipole but also the radiative forces, while a trap using a far-off resonance dominates only the dipole force. We estimate a near-optical resonant trap for ultracold rubidium atoms in the range between −0.373 and −2.23 THz from the resonance. The time dependence of the trapped atoms indicates some difference of the stable center-of-mass positions in the near-optical resonant trap, and also indicates that the differences are caused by the change of the equilibrium condition of the optical dipole and radiative forces. A stable position depends only on laser detuning due to the change in the radiative force; however, the position is ineffective against the change in the laser intensity, which results in a change in the radiative force.

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“…Chapman et al managed to condense 87 Rb in a dipole trap consisting of two crossed CO 2 laser beams by means of evaporative cooling [17] and all-optical crossed-beam setups have also enabled the first observation of Bose-Einstein condensation of cesium and ytterbium atoms [18,19]. Optical traps consisting of one single focused laser beam were used to produce degenerate Fermi gases [20] and Fermi gas mixtures [21] and to achieve condensation of 87 Rb [23], and they are a popular way to trap and store cold gases for multiple needs [24][25][26][27][28][29].…”

Section: Introductionmentioning

confidence: 99%

Bose gas in a single-beam optical dipole trap

Simon

Strunz

2010

Phys. Rev. A

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We study an ultracold Bose gas in an optical dipole trap consisting of one single focused laser beam. An analytical expression for the corresponding density of states beyond the usual harmonic approximation is obtained. We are thus able to discuss the existence of a critical temperature for Bose-Einstein condensation and find that the phase transition must be enabled by a cutoff near the threshold. Moreover, we study the dynamics of evaporative cooling and observe significant deviations from the findings for the well-established harmonic approximation. Furthermore, we investigate Bose-Einstein condensates in such a trap in Thomas-Fermi approximation and determine analytical expressions for chemical potential, internal energy, and Thomas-Fermi radii beyond the usual harmonic approximation.

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Optimal geometry for efficient loading of an optical dipole trap

Cited by 5 publications

References 14 publications

Effect of AC-Stark shift in optical dipole trap on absorption imaging of trapped atoms

Effect of AC-Stark shift in optical dipole trap on absorption imaging of trapped atoms

Effective trapping of cold atoms using dipole and radiative forces in an optical trap

Bose gas in a single-beam optical dipole trap

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