The formation of dark states under interaction of degenerate atomic states with incoherent broadband radiation (white light) is discussed. A simple coupling scheme in a three level Lambda-system, which allows both qualitative and quantitative analysis is discussed. We found a stationary solution of the optical Bloch equations in a broad excitation line approximation that describes the dynamics of the atom-white light interaction and demonstrated its identity to a conventional dark state created with coherent laser fields. We than examine the efficiency of the population transfer induced by broadband radiation in a model Lambda-system and revealed that high efficiency (attaining 100 percent) of stimulated Raman adiabatic passage-like processes can be achieved with certain temporal control of light polarization. The corresponding criterion of adiabaticity was formulated and justified by means of numerical simulations.
|Journal||Physical Review A - Atomic, Molecular, and Optical Physics|
|Publication status||Published - 2008|
Auzinsh, M., Bezuglov, N., & Miculis, K. (2008). Manipulation of Dark States and Control of Coherent Processes with Spectrally Broad Light. Physical Review A - Atomic, Molecular, and Optical Physics, 78(5), 0531415_1-10. https://doi.org/DOI: 10.1103/PhysRevA.78.053415