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- W115985711 abstract "Strong pumping of “extended” alkali metal vapors near two-photon resonances produces copious stimulated emissions by amplified spontaneous emission (ASE) or stimulated electronic hyper-Raman scattering (SEHRS), and by phase matched parametric four-wave mixing (PFWM). The new electromagnetic fields that are generated within the near-resonant nonlinear medium can strongly influence the total atomic response through processes including interferences, level shifting, and population transfer mechanisms. The internally generated fields can, e.g., suppress transition probabilities for processes involving excitations (SEHRS and two-photon excitations) and produce gain saturation for PFWM processes. Recent experiments have demonstrated that in two-photon resonant pumping of S → D and S → S transitions in Na, the excitation rate is strongly reduced through a two-photon interference effect involving PFWM.1-5 In this process, two-photon pumping from the ground state, ∣0 >, to a two-photon level, ∣2 >, by laser photonsω1 andω2 with two-photon Rabi frequency (Omega _{02}^2) produces two new frequencies ω3 and ω4 through PFWM. These generated fields create a second two-photon Rabi rate (tilde Omega _{02}^{(2)}) between the same two states. Under phase matched PFWM generation, the second pathway destructively interferes with the first;1’2,6,7 that is, in the equations of motion the two-photon pumping rate by the laser field, (Omega _{02}^2), is cancelled off by the two-photon rate (tilde Omega _{02}^{(2)}) due to PFWM which becomes equal in magnitude but opposite in sign $$Omega _{02}^{(2)} = - tilde Omega _{02}^{(2)}$$(1)" @default.
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- W115985711 date "1990-01-01" @default.
- W115985711 modified "2023-09-25" @default.
- W115985711 title "Saturation Behavior of Parametric Four-Wave Mixing Due to Two-Photon Interference Effect" @default.
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- W115985711 doi "https://doi.org/10.1007/978-1-4613-0847-8_71" @default.
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