Simultaneous loading of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mrow /><mml:mn>39</mml:mn></mml:msup></mml:math>K and Rb into a crossed dipole trap: Characterization and two-body losses

Menegatti, Carlos Renato; Marangoni, Bruno; Tallant, Jonathan; Marcassa, Luís Gustavo

doi:10.1103/physreva.88.023411

Cited by 4 publications

(3 citation statements)

References 32 publications

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“…The same laser beam is recycled to create the crossed trapping region. To ensure that the high-power laser is properly aligned to the MOT for the PA experiment, we first load the optical dipole trap and measure its lifetime as described in [26,31]. At the typicalinitial conditions, we load about (1.4± 0.2)×10 6 of Figure 1.…”

Section: Methodsmentioning

confidence: 99%

Formation of ultracold molecules induced by a high-power single-frequency fiber laser

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Colín-Rodríguez

Silva

et al. 2017

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

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The influence of a high-power single-frequency fiber laser on the formation of ultracold 85 Rb 2 molecules is investigated as a function of its frequency (in the 1062-1070 nm range) in a magneto-optical trap. We find evidence for the formation of ground-state 85 Rb 2 molecules in low vibrational levels (  v 20) with a maximal rate of 10 4 s −1 , induced by short-range photoassociation by the fiber laser followed by spontaneous emission. When this laser is used to set up a dipole trap, we measure an atomic loss rate at a wavelength far from the PA resonances, only four times smaller than that observed at a PA resonance wavelength. This work may have important consequences for atom trapping using lasers around the conventional 1064nm wavelength.

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Section: Methodsmentioning

confidence: 99%

Formation of ultracold molecules induced by a high-power single-frequency fiber laser

Passagem

Colín-Rodríguez

Silva

et al. 2017

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

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“…The hyperfine state-changing collisions and rate coefficient were measured by optical pumping atoms to the upper hyperfine state in this mixed atomic sample [13]. Heteronuclear binary collisions were observed in K-Rb atoms with a non-exponential decay [14]. Heteronuclear collisions in a micro optical trap were recently measured and analyzed in 85 Rb- 87 Rb systems [15].…”

Section: Introductionmentioning

confidence: 99%

Ultracold collisions of mixed atoms in optical dipole trap loaded from a dark magneto-optical trap

Zhao¹,

Gong²,

Li³

et al. 2017

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

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We study the cold collisions of mixed atoms in an optical dipole trap (ODT), which are loaded from a dark magneto-optical trap (MOT). A comprehensive, phenomenological rate equation is presented to derive the ultracold homonuclear and heteronuclear collision rates in loading and holding procedures. Our results show that the cold atoms in the dark MOT can provide a much better stable, initial atomic sample than MOT. The dependence of the heteronuclear collision rate on the trap depth is attributed to the hyperfine-changing collision by the ODT laser with a broad linewidth. The processes of deriving the collision rate are also universal for other kinds of atoms or even molecules.

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“…In the last years, atomic population lifetime measurements, performed in our old ODT, strongly suggest that the trap laser was able to produce molecules via photoassociation, due to its bandwidth of ~ 2 nm. (78)(79) Based on this result, we have decided to implement a major modification of our experimental setup, which allows us to control the molecular states that are accessed in the photoassociation process. The old high power broadband fiber laser was replaced by a YAR high power amplifier described in section 4.1.4.…”

Section: Photoassociationmentioning

confidence: 99%

Photoassociation and vibrational cooling of Rb<sub>2</sub> molecules with a high-power laser

Silva¹

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We have developed a technique to produce, manipulate and trap Rb2 molecules with a single optical beam. This beam is generated by a high-power fiber amplifier (50 W of total output power) in the 1060 to 1070 nm range, which is seeded by two light sources: a sharp-band laser and a broadband superluminescent diode. The laser source is tuned to produce Rb2 molecules from an ultracold 85 Rb sample via photoassociation. The broadband spectrum vibrationally cool the molecules by optical pumping. This source is spectrally shaped in order to populate the molecules at the fundamental vibrational state = 0. The molecular sample is probed by twophoton ionization, promoted by a pulsed dye laser in the 475 to 480 nm range. By scanning the photoassociation laser frequency, we have obtained a photoassociation spectrum of the ′ = 138 state of the 0 + potential, confirming previous observations. We have also obtained two vibrational spectra of the molecules by varying the ionization laser frequency, in the presence and absence of the broadband source. The comparison between the two spectra, along with abinitio data, provides evidences that the molecules are optically pumped to the fundamental vibrational state.

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Simultaneous loading of39K and Rb into a crossed dipole trap: Characterization and two-body losses

Cited by 4 publications

References 32 publications

Formation of ultracold molecules induced by a high-power single-frequency fiber laser

Formation of ultracold molecules induced by a high-power single-frequency fiber laser

Ultracold collisions of mixed atoms in optical dipole trap loaded from a dark magneto-optical trap

Photoassociation and vibrational cooling of Rb<sub>2</sub> molecules with a high-power laser

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