Transient dynamics and momentum redistribution in cold atoms via recoil-induced resonances
| Autor: | Greenberg, Joel A., Gauthier, Daniel J. |
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| Rok vydání: | 2008 |
| Předmět: | |
| Zdroj: | Phys. Rev. A 79, 033414 (2009) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevA.79.033414 |
| Popis: | We use an optically dense, anisotropic magneto-optical trap to study recoil-induced resonances (RIRs) in the transient, high-gain regime. We find that two distinct mechanisms govern the atomic dynamics: the finite, frequency-dependent atomic response time, and momentum-space population redistribution. At low input probe intensities, the residual Doppler width of the atoms, combined with the finite atomic response time, result in a linear, transient hysteretic effect that modifies the locations, widths, and magnitudes of the resulting gain spectra depending on the sign of the scan chirp. When larger intensities (\textit{i.e.}, greater than a few $\mu$W/cm$^2$) are incident on the atomic sample for several $\mu$s, hole-burning in the atomic sample's momentum distribution leads to a coherent population redistribution that persists for approximately 100 $\mu$s. We propose using RIRs to engineer the atomic momentum distribution to enhance the nonlinear atom-photon coupling. We present a numerical model, and compare the calculated and experimental results to verify our interpretation. Comment: 7 pages, 6 figures |
| Databáze: | arXiv |
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