All-optical formation of a Bose–Einstein condensate for applications in scanning electron microscopy

Gericke, Tatjana; Würtz, Peter; Reitz, D.; Utfeld, C.; Ott, Herwig

doi:10.1007/s00340-007-2862-9

Cited by 25 publications

(24 citation statements)

References 15 publications

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“…Magneto Optical Traps for 87 Rb The 2D MOT [41] setup is based on a design described in [42,43]. The elongated titanium vacuum chamber features four windows with a clear aperture of 110 mm x 25 mm as an optical access for the MOT beams.…”

Section: Cooling and Trappingmentioning

confidence: 99%

Neutral impurities in a Bose-Einstein condensate for simulation of the Fröhlich-polaron

Hohmann

Kindermann

Gänger

et al. 2015

EPJ Quantum Technol.

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We present an experimental system to study the Bose polaron by immersion of single, wellcontrollable neutral Cs impurities into a Rb Bose-Einstein condensate (BEC). We show that, by proper optical traps, independent control over impurity and BEC allows for precision relative positioning of the two sub-systems as well as for independent read-out. We furthermore estimate that measuring the polaron binding energy of Fröhlich-type Bose polarons in the low and intermediate coupling regime is feasible with our experimental constraints and limitations discussed.

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Section: Cooling and Trappingmentioning

confidence: 99%

Neutral impurities in a Bose-Einstein condensate for simulation of the Fröhlich-polaron

Hohmann

Kindermann

Gänger

et al. 2015

EPJ Quantum Technol.

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“…5). The structure of the potential is clearly visible and from a quantitative evaluation we can deduce a spatial resolution of better than 150 nm [39]. With such a high resolution, the technique can immediately be used for single-site addressing in an optical lattice.…”

Section: Single Site Addressingmentioning

confidence: 88%

Scanning electron microscopy of cold gases

Santra

Ott

2015

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

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Abstract. Ultracold quantum gases offer unique possibilities to study interacting many-body quantum systems. Probing and manipulating such systems with ever increasing degree of control requires novel experimental techniques. Scanning electron microscopy is a high resolution technique which can be used for in situ imaging, single site addressing in optical lattices and precision density engineering. Here, we review recent advances and achievements obtained with this technique and discuss future perspectives.arXiv:1504.00277v1 [cond-mat.quant-gas]

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“…1 (a). Making use of this method, we demonstrate the generation of BEC in a single beam ODT at a wavelength of 1960 nm with a volume rather large compared to similar experiments [9,13,15,16].The ODT used here is derived from a single mode Thulium-doped fiber laser (TLR-50-1960-LP, IPG Photonics) operating at a wavelength of 1960 nm with M 2 < 1.1 and a FWHM linewidth of 1 nm. This laser beam is…”

mentioning

confidence: 91%

“…a Nd:YAG laser at a wavelength of 1064 nm. This stronger confinement is still enough to allow for the realization of a BEC with more than 10 5 atoms [13]. Nevertheless, this method is bound to the use of far-infrared laser wavelengths with all the associated technical implications.…”

mentioning

confidence: 99%

Simple method for generating Bose-Einstein condensates in a weak hybrid trap

Zaiser¹,

Hartwig²,

Schlippert³

et al. 2011

Phys. Rev. A

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We report on a simple novel trapping scheme for the generation of Bose-Einstein condensates of 87 Rb atoms. This scheme employs a near-infrared single beam optical dipole trap combined with a weak magnetic quadrupole field as used for magneto-optical trapping to enhance the confinement in axial direction. Efficient forced evaporative cooling to the phase transition is achieved in this weak hybrid trap via reduction of the laser intensity of the optical dipole trap at constant magnetic field gradient.A simple and robust method for the generation of quantum degenerate atomic gases with decent particle number and repetition rate is of interest for the study of their fundamental properties [1][2][3] or their applications in atomic inertial sensors [4] and gravimeters [5], as well as in microgravity [6]. Here, we describe a very simple method for the generation of a Bose-Einstein condensate (BEC) in a single beam near-infrared optical dipole trap (ODT). Optical dipole traps offer great potential with respect to the criteria mentioned above. Forced evaporative cooling in such traps is usually achieved by reducing the power of the ODT laser beam [7] and rethermalization times are generally short due to the high trapping frequencies in the kHz-regime usually provided by an ODT. However, power reduction also reduces the confinement of the atoms in the trap which in turn negatively affects trap frequencies, peak atomic density, elastic collision rate, and as a consequence the efficiency of forced evaporation. This counteracts the gain in phase space density by the cooling of the atomic cloud, thus preventing the regime of run-away evaporation in an ODT with this simple method [8]. Quantum degeneracy can nonetheless be reached in these traps, provided the initial atomic and phase space densities were high enough [9,10]. Nevertheless, the necessary compromise between high initial densities and high initial trapping volume severely affects the maximum number of particles in the BEC and additional sophisticated concepts for reaching optimized initial atomic and phase space densities may be required [11].The most simple realization of an ODT is to focus one single far-off resonant high power laser beam onto the atomic ensemble. However, due to the rather low confinement of the atoms in the axial direction of these single beam ODTs, the high initial atomic and phase space densities needed to reach quantum degeneracy are very hard to realize. This is particularly the case for single beam ODTs formed from a near-infrared laser source [12]. In * Rasel@iqo.uni-hannover.de contrast, the wavelength of a CO 2 laser of ∼ 10.6 µm provides an axial trapping frequency an order of magnitude higher compared to an ODT formed from e.g. a Nd:YAG laser at a wavelength of 1064 nm. This stronger confinement is still enough to allow for the realization of a BEC with more than 10 5 atoms [13]. Nevertheless, this method is bound to the use of far-infrared laser wavelengths with all the associated technical implications. If the use of laser wavelength...

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All-optical formation of a Bose–Einstein condensate for applications in scanning electron microscopy

Cited by 25 publications

References 15 publications

Neutral impurities in a Bose-Einstein condensate for simulation of the Fröhlich-polaron

Neutral impurities in a Bose-Einstein condensate for simulation of the Fröhlich-polaron

Scanning electron microscopy of cold gases

Simple method for generating Bose-Einstein condensates in a weak hybrid trap

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