Saturation of Two-Photon-Resonant Optical Processes in Cesium Vapor

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Abstract
We report observations of saturation of two-photon-resonant third-harmonic generation and of fluorescence following two-photon absorption in cesium vapor. Weakening dependence of these processes on fundamental power and broadening of the resonance line with increased fundamental power are both seen. It is shown that hole burning is important in a certain power range with the resonance becoming predominantly homogeneously broadened at higher power levels.