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We employ doubly-resonant two-photon excitation into the 74S Rydberg state tospectroscopically measure the dynamic scalar polarizability, alpha 0, andtensor polarizability, alpha 2, of rubidium 5P3/2. To reach the necessary highintensities, we employ a cavity-generated 1064 nm optical-lattice light field,allowing us to obtain intensities near 2x10^11 W/m^2. In the evaluation of thedata we use a self-referencing method that renders the polarizabilitymeasurement largely free from the intensity calibration of the laser lightfield. We obtain experimental values alpha 0 =-1149 (pm 2.5 percent) and alpha2 = 563 (pm 4.2 percent), in atomic units. Methods and results are supported bysimulations.

Measurement of Rb 5P3/2 scalar and tensor polarizabilities in a 1064 nm light field