Near-resonant optical forces beyond the two-level approximation for a continuous source of spin-polarized cold atomsReport as inadecuate




Near-resonant optical forces beyond the two-level approximation for a continuous source of spin-polarized cold atoms - Download this document for free, or read online. Document in PDF available to download.

1 ICFO - Institut de Ciencies Fotoniques Castelldefels 2 ICREA - Institució Catalana de Recerca i Estudis Avançats Barcelona

Abstract : We propose a method to generate a source of spin-polarized cold atoms which are continuously extracted and guided from a magneto-optical trap using an atom-diode effect.
We show that it is possible to create a pipe-like potential by overlapping two optical beams coupled with the two transitions of a three-level system in a ladder configuration.
With alkali-metal atoms, and in particular with $^{87}$Rb, a proper choice of transitions enables both the potential generation and optical pumping, thus polarizing the sample in a given Zeeman state.
We extend the Dalibard and Cohen-Tannoudji dressed-atom model of radiative forces to the case of a three-level system.
We derive expressions for the average force and the different sources of momentum diffusion in the resonant, non-perturbative regime.
We show using numerical simulations that a significant fraction of the atoms initially loaded can be guided over several centimeters with output velocities of a few meters per second.
This would produce a collimated continuous source of slow spin-polarized atoms suitable for atom interferometry.






Author: Thomas Vanderbruggen - Morgan Mitchell -

Source: https://hal.archives-ouvertes.fr/



DOWNLOAD PDF




Related documents