Optical Molasses and the Orbital Angular Momentum of Light
Recent work has shownl,2 that the near-resonance interaction of atoms with a Laguerre-Gaussian (LG) beam provides new effects associated with the orbital angular momentum properties of the light3. In particular such atoms are subject to a torque about the beam axis and an additional non-axial Doppler shift. It has been suggested1,2 that these mechanisms may have some useful consequences in the field of cooling and trapping of atoms and ions. We have therefore considered the dissipative force on a two-level atom due to two counter-propagating LG beams 1 and 2.
KeywordsOrbital Angular Momentum Axial Motion Azimuthal Velocity Dissipative Force Angular Momentum Quantum Number
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