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VOLUME 82 (2005) | ISSUE 1 | PAGE 18
2D laser collimation of a cold Cs beam induced by a transverse B-field
PACS: 32.60.+i
Abstract
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-\parallel-lin configuration is made possible by the application of a transverse magnetic field B_{\perp}. The phenomenon described differs from grey 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 B_{\perp}^{2}. The collimated flux density shows a dip as a function of B_{\perp}, the width of which is proportional to the cube root of the laser intensity, general features predicted by our semi-classical model. This technique provides a sensitive tool for cancelling transverse magnetic fields in situ at the milligauss level.