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
Original Manuscript: April 16, 1993
Published: October 15, 1993
C. L. A. Collins, K. D. Bonin, and M. A. Kadar-Kallen, "Absolute two-photon cross section of Rb measured by differential absorption," Opt. Lett. 18, 1754-1756 (1993)