2017
DOI: 10.1103/physreva.96.013424
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Bichromatic force on metastable argon for atom-trap trace analysis

Abstract: For an efficient performance of Atom Trap Trace Analysis, it is important to collimate the particles emitted from an effusive source. Their high velocity limits the interaction time with the cooling laser. Therefore forces beyond the limits of the scattering force are desirable. The bichromatic force is a promising candidate for this purpose which is demonstrated here for the first time on metastable argon-40. The precollimated atoms are deflected in one dimension and the acquired Doppler shift is detected by … Show more

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Cited by 6 publications
(5 citation statements)
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“…Two vertical red lines mark the region where the magnitude of the BCF exceeds purely radiative pressure. Sharp resonances around 0 and ±45 m/s represent Doppleron resonances and have been previously seen in BCF profiles for atoms [42]. Solid horizontal green line shows the average bichromatic force achieved in the experiment.…”
supporting
confidence: 52%
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“…Two vertical red lines mark the region where the magnitude of the BCF exceeds purely radiative pressure. Sharp resonances around 0 and ±45 m/s represent Doppleron resonances and have been previously seen in BCF profiles for atoms [42]. Solid horizontal green line shows the average bichromatic force achieved in the experiment.…”
supporting
confidence: 52%
“…Using the measured optimal BCF deflections for SrOH we obtain F BCF = (3.7 ± 0.7) F rad , which is 35% lower compared to the predicted value. Experimental observations of BCF for atoms have seen significant reduction in the force magnitude under realistic experimental conditions [42]. In our experiment, some of possible explanations for discrepency are power imbalance between the two beat note trains, less than unity overlap efficiency between the laser and molecular beams, and a dependence of the two forces on irradiance which favors the radiative force in the wings of the Gaussian laser profile.…”
mentioning
confidence: 49%
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“…In the present experiment the potential depth of each lattice site would be much too shallow to trap atoms at the observed temperatures and the gradient forces average to zero on a length scale larger than the optical wavelength. However, introducing a second frequency to the laser field can drastically change the situation resulting in bichromatic forces (for a recent example see [24]).…”
Section: Trapping Mechanismmentioning
confidence: 99%
“…This makes BCF more applicable than the spontaneous force in manipulating diatomic and polyatomic molecules which lack near-cycling transitions due to poor vibrational overlap. BCF has been observed and studied in various atomic systems [18,[21][22][23][24][25][26]. Here we demonstrate the effectiveness of BCF in a molecular system via the transverse deflection of a beam of CaF, a polar diatomic molecule, as shown in Fig.…”
mentioning
confidence: 67%