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We describe and use a time-resolved pump-stimulated emission pumpspectroscopic technique to measure collisional relaxation in a high-lyingenergy level of atomic cesium. Aligned $8p\,^2P_{3/2}$ cesium atoms wereproduced by a pump laser. A second laser, the stimulated emission pump,promoted the population exclusively to the $5d\,^2D_{5/2}$ level. The intensityof the $5d\,^2D_{5/2}\rightarrow6s\,^2S_{1/2}$ cascade fluorescence at 852.12nm was monitored. The linear polarization dependence of the$6s\,^2S_{1/2}\rightarrow8p\,^2P_{3/2}\rightarrow5d\,^2S_{5/2}$ transition wasmeasured in the presence of argon gas at various pressures. From themeasurement, we obtained the disalignment cross section value for the$8p\,^2P_{3/2}$ level due to collisions with ground-level argon atoms.

Time-resolved UV-IR pump-stimulated emission pump spectroscopy to probe collisional relaxation of $8p\,^2P_{3/2}$ Cs I