Efficient production of an 87Rb F = 2, mF = 2 Bose-Einstein condensate in a hybrid trap

Mishra, Hari Prasad; Flores, Adonis Silva; Vassen, W.; Knoop, Steven

doi:10.1140/epjd/e2015-50843-y

Cited by 8 publications

(17 citation statements)

References 28 publications

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“…An order of magnitude improvement is observed in the He * 3D-MOT atom number as already reported in reference [60]. Correspondingly, the Rb 3D-MOT atom number also improves by at least a factor of three compared to reference [59].…”

Section: Two-species Motsupporting

confidence: 76%

“…Details of our experimental setup have been given in reference [57] [59], in which we implement a hybrid trap (single-beam optical dipole trap combined with a weak quadrupole magnetic trap) to achieve Bose-Einstein condensation of 87 Rb and reference [60], where we demonstrate the production of 4 He * Bose-Einstein condensates in a single-beam optical dipole trap. In this paper, we focus on the scheme that is relevant for simultaneous loading of the two atomic species in an optical dipole trap.…”

Section: Methodsmentioning

confidence: 99%

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An ultracold, optically trapped mixture of 87Rb and metastable 4He atoms

et al. 2017

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Abstract. We report on the realization of an ultracold (<25 μK) mixture of rubidium ( 87 Rb) and metastable triplet helium ( 4 He) in an optical dipole trap. Our scheme involves laser cooling in a dual-species magneto-optical trap, simultaneous MW-and RF-induced forced evaporative cooling in a quadrupole magnetic trap, and transfer to a single-beam optical dipole trap. We observe long trapping lifetimes for the doubly spin-stretched spin-state mixture and measure much shorter lifetimes for other spin-state combinations. We discuss prospects for realizing quantum degenerate mixtures of alkali-metal and metastable helium atoms.

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Section: Two-species Motsupporting

confidence: 76%

Section: Methodsmentioning

confidence: 99%

An ultracold, optically trapped mixture of 87Rb and metastable 4He atoms

et al. 2017

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“…[26], while our HT (applied to 87 Rb) has been discussed in Ref. [3]. Here we will summarize the most important features and mention changes made compared to previous work.…”

Section: Methodsmentioning

confidence: 99%

“…Efficient evaporation and BoseEinstein condensation (BEC) have been demonstrated (see, e.g., [1][2][3]), using ODT powers of only a few Watts. By switching off the QMT completely, the atoms are transferred from the HT to a pure ODT.…”

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confidence: 99%

Simple method for producing Bose–Einstein condensates of metastable helium using a single-beam optical dipole trap

et al. 2015

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Alternatively, one loads the atoms first in a magnetic trap and performs evaporative cooling and afterward transfers a dense and compact atomic cloud into an ODT, which now requires a much lower ODT power, at the expense of experimental complexity. Within this last category, a very elegant approach is the hybrid trap (HT), introduced in Ref.[1], consisting of a simple quadrupole magnetic trap (QMT) and a single-beam ODT. Efficient evaporation and BoseEinstein condensation (BEC) have been demonstrated (see, e.g., [1][2][3]), using ODT powers of only a few Watts. By switching off the QMT completely, the atoms are transferred from the HT to a pure ODT.The hybrid trap has been mostly applied to 87 Rb, but is assumed to be generally applicable to other magnetically trappable atomic species [1]. However, the application of HT strongly depends on the mass of atom. Most importantly, the rates of Majorana loss and heating, which determine the temperature that can be reached by evaporative cooling in a QMT, scale inversely with mass [4,5]. This limits the transfer efficiency for light atoms, or puts constraints on the trap volume and trap depth, and therefore the power, of the ODT. Furthermore, for light atoms evaporative cooling in the HT is limited as the additional axial confinement provided by the QMT is small because of the small levitation gradient, below which the QMT has to operate in the HT. Finally, the small levitation gradient puts experimental limits on the control of the displacement of the QMT with respect to the ODT, which further limits the axial confinement.Here we report on the production of a metastable triplet helium ( 4 He * ) BEC using a single-beam HT with a moderate power of less than 3 W, demonstrating the application of HT for a light atom. Our work provides a novel and simple method for obtaining a 4 He * BEC, which can be used for atom optics experiments [6][7][8][9][10] or precision spectroscopy Abstract We demonstrate a simple scheme to reach Bose-Einstein condensation (BEC) of metastable triplet helium atoms using a single-beam optical dipole trap with moderate power of less than 3 W. Our scheme is based on RF-induced evaporative cooling in a quadrupole magnetic trap and transfer to a single-beam optical dipole trap that is located below the magnetic trap center. We transfer 1 × 10 6 atoms into the optical dipole trap, with an initial temperature of 14 µK, and observe efficient forced evaporative cooling both in a hybrid trap, in which the quadrupole magnetic trap operates just below the levitation gradient, and in the pure optical dipole trap, reaching the onset of BEC with 2 × 10 5 atoms and a pure BEC of 5 × 10 4 atoms. Our work shows that a single-beam hybrid trap can be applied for a light atom, for which evaporative cooling in the quadrupole magnetic trap is strongly limited by Majorana spin-flips, and the very small levitation gradient limits the axial confinement in the hybrid trap.

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“…Although many different approaches and technical solutions have been demonstrated [12][13][14] , all implementations rely on laser cooling and forced evaporative cooling. In this context, red-detuned optical dipole traps 15 are nowadays widely used for a fast and robust path to quantum degeneracy [16][17][18] . Their success is mainly due to the large optical access, the high level of experimental control and flexibility, and the possibility to achieve state-insensitive trapping.…”

Section: Introductionmentioning

confidence: 99%

Compact setup for the production of 87Rb |F= 2,mF= + 2〉 Bose-Einstein condensates in a hybrid trap

Nolli

Venturelli

Marmugi

et al. 2016

Review of Scientific Instruments

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We present a compact experimental apparatus for Bose-Einstein condensation of (87)Rb in the |F = 2, mF = + 2〉 state. A pre-cooled atomic beam of (87)Rb is obtained by using an unbalanced magneto-optical trap, allowing controlled transfer of trapped atoms from the first vacuum chamber to the science chamber. Here, atoms are transferred to a hybrid trap, as produced by overlapping a magnetic quadrupole trap with a far-detuned optical trap with crossed beam configuration, where forced radiofrequency evaporation is realized. The final evaporation leading to Bose-Einstein condensation is then performed by exponentially lowering the optical trap depth. Control and stabilization systems of the optical trap beams are discussed in detail. The setup reliably produces a pure condensate in the |F = 2, mF = + 2〉 state in 50 s, which includes 33 s loading of the science magneto-optical trap and 17 s forced evaporation.

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Efficient production of an 87Rb F = 2, mF = 2 Bose-Einstein condensate in a hybrid trap

Cited by 8 publications

References 28 publications

An ultracold, optically trapped mixture of 87Rb and metastable 4He atoms

An ultracold, optically trapped mixture of 87Rb and metastable 4He atoms

Simple method for producing Bose–Einstein condensates of metastable helium using a single-beam optical dipole trap

Compact setup for the production of 87Rb |F= 2,mF= + 2〉 Bose-Einstein condensates in a hybrid trap

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