Abstract

We applied a simple, sensitive differential absorption technique to measure the two-photon cross section for the 52S1/2(Fg = 2) → 52D5/2(F = 4) hyperfine transition in 85Rb [σ(2) = (1.2 ± 0.5) × 10−18 cm4/W]. The detection circuit permitted straightforward measurements close to the shot-noise limit. Detailed quantitative analysis of the measurements shows excellent agreement with theory.

© 1993 Optical Society of America

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