Abstract

We propose a novel scheme to generate a cw cold molecular beam by optically guided buffer-gas-cooled molecules around an S-shaped integrated fiber bundle. First we calculate the two-color evanescent field around the fiber bundle and its optical potential for ${\mathrm{I}}_2$ molecules. Then we estimate the guiding efficiency of the output molecular beam and its transverse and longitudinal temperatures based on a classical model. Finally, we study the dynamic process of the molecular guiding by using a classical Monte Carlo simulation, by which we obtain some simulated results consistent with the theoretically calculated results. Our study shows that when the power of the input ${\mathrm{CO}}_2$ laser is $10\mathrm{W}$ and the curvature radius of the fiber bundle is $0.2\mathrm{cm}$, a cw cold molecular beam with a longitudinal and transverse temperature of $57\mathrm{mK}$ and $0.29\mathrm{mK}$ can be generated by our scheme. It is clear that such a cold molecular beam has some important applications in molecular optics and other fields.

© 2011 Optical Society of America

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