Faculté des sciences

2D laser collimation of a cold Cs beam induced by a transverse B field

Plimmer, M. ; Castagna, N. ; Di Domenico, G. ; Thomann, Pierre ; Taichenachev, A. V. ; Yudin, V. I.

In: JETP Letters, 2005, vol. 82, no. 1, p. 17-21

We describe transverse collimation of a continuous cold cesium beam (longitudinal temperature 75 μK) induced by a two-dimensional, blue-detuned near-resonant optical lattice. The mechanism described for a lin-||-lin configuration is made possible by the application of a transverse magnetic field B. The phenomenon described differs from gray molasses, for which any small... Plus

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    Summary
    We describe transverse collimation of a continuous cold cesium beam (longitudinal temperature 75 μK) induced by a two-dimensional, blue-detuned near-resonant optical lattice. The mechanism described for a lin-||-lin configuration is made possible by the application of a transverse magnetic field B. The phenomenon described differs from gray molasses, for which any small magnetic field degrades cooling, as well as from magnetically induced laser cooling in red-detuned optical molasses, where there are no dark states. The lowest transverse temperature is experimentally found to vary as B2 . The collimated flux density shows a dip as a function of B, the width of which is proportional to the cube root of the laser intensity, general features predicted by our semiclassical model. This technique provides a sensitive tool for canceling transverse magnetic fields in situ at the milligauss level.