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Sub-Doppler Laser Cooling using Electromagnetically Induced Transparency | | Peiru He
; Phoebe M. Tengdin
; Dana Z. Anderson
; Ana Maria Rey
; Murray Holland
; | | Date: |
28 Sep 2016 | | Abstract: | We propose a sub-Doppler laser cooling mechanism that takes advantage of the
unique spectral features and extreme dispersion generated by the phenomenon of
electromagnetically induced transparency (EIT). EIT is a destructive quantum
interference phenomenon experienced by atoms with multiple internal quantum
states when illuminated by laser fields with appropriate frequencies. By
detuning the lasers slightly from the "dark resonance", we observe that, within
the transparency window, atoms can be subject to a strong viscous force, while
being only slightly heated by the diffusion caused by spontaneous photon
scattering. In contrast to other laser cooling schemes, such as polarization
gradient cooling or EIT-sideband cooling, no external magnetic field or strong
external confining potential is required. Using a semiclassical approximation,
we derive analytically quantitative expressions for the steady-state
temperature, which is confirmed by full quantum mechanical numerical
simulations. We find that the lowest achievable temperatures approach the
single-photon recoil energy. In addition to dissipative forces, the atoms are
subject to a stationary conservative potential, leading to the possibility of
spatial confinement. We find that under typical experimental parameters this
effect is weak and stable trapping is not possible. | | Source: | arXiv, 1609.9105 | | Services: | Forum | Review | PDF | Favorites | |
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