首页|Resonant enhancement of two-photon absorption in rubidium with crossed polarizations
Resonant enhancement of two-photon absorption in rubidium with crossed polarizations
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NSTL
Elsevier
The rubidium 5(2) S-1/2 -> 5(2) D-3/2 and 5(2) S-1/2 -> 5(2) D-5/2 two-color two-photon transitions were examined with a variety of detunings in the region 758-798 nm to reveal the transition rates. Two cw lasers with crossed linear polarizations were overlapped and counterpropagated through a vapor cell, with the transition rate monitored by side fluorescence from 6P. Resonant enhancement via the 5P states results in intensity variations of over 6 orders of magnitude across the detuning range. No destructive interference zeros were seen, as expected from the polarization dependent calculation of the third-order susceptibility. Zeros occur from interference between two intermediate states, but due to the contributions from both symmetric and antisymmetric susceptibility tensors the zero of one is hidden by a non-zero value of the other. The polarization dependence was explicitly seen by fixing the detuning and iterating the linear polarizations from crossed to parallel.
NSTL
Elsevier
