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Optica Publishing Group
  • Quantum Electronics and Laser Science Conference
  • OSA Technical Digest (Optica Publishing Group, 2001),
  • paper QFD5

Anisotrop velocity distributions in 3D optical lattices

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Abstract

We have measured velocity distributions in two dimensions, as a function of intensity, in a 3D near resonant optical lattice (NROL) in Cs. The NROL is created by two orthogonally polarized pairs of laser beams that propagate in the yz and xz plane respectively. The angle between the beams of each pair is 90°, and each beam forms an angle of θ = 45° with the (vertical) quantization (z-) axis. This results in a tetragonal structure in which the lattice constants are az = λ/(2V2) and ax,y = λ/2, where λ = 852 nm. The difference in lattice constants means that lattice sites have anisotrop trapping potentials, where the oscillation frequencies differ with a factor of 2 along x and z, in a harmonic approximation.

© 2001 Optical Society of America

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