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Acta Sinica Quantum Optica

The Amplifier of Stimulated Raman Four-wave Mixing in Cesium Atoms

王红丽 WANG Hong-li, 王丹 Wang Dan, 郭苗军 GUO Miao-jun, 周海涛 Zhou Haitao, 张俊香 ZHANG Jun-xiang

Published Jan 1, 2015• 0 citations
Publisher
DOI
10.3788/asqo20152101.0033

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Collimated ultraviolet (UV) light is generated via four-wave mixing (FWM) in cesium vapor by continuously tuning the wavelength of the pump laser. Terahertz (THz) Stokes light is generated by the stimulated Raman scattering (SRS) effect in the FWM process, and its frequency is adjustable. When exciting the cesium atom to a virtual level using different combinations of pump lasers (P1 and P2), the strength distribution of UV light is asymmetric, which can be explained through a phase-matching mechanism. Furthermore, the SRS effect and phase matching influence the FWM.
The suppression of forward-propagating stimulated hyper-Raman (SHR) emission is well studied in sodium vapor. Theory predicts that SHR emission to a state linked to the gound state by a one-photon transition is suppressed by an interference with a four-wave-mixing (FWM) emission that links that state to the ground state. Since FWM emission only propagates in the forward direction due to phase-matching considerations, only the forward SHR emission is suppressed. This has been previously demonstrated in sodium. An obvious corollary to this theory is that no suppression occurs if the state is not linked to the ground state by a one-photon transition. A serendipitous arrangement of energy levels in cesium allowed this corollary to be tested and confirmed here.