Application of two-photon selective excitation to isotope separation with high power, high resolution tunable lasers is discussed. A simple kinetic model is given to determine quantum efficiency and separation factor in terms of laser powers and relaxation constants. A numerical example is used to demonstrate the feasibility of the scheme. Results indicate that a high quantum yield is obtainable with the optical technique.
Yung S. Liu, "Laser Isotope Separation Using Two-Photon Selective Excitation; Its Quantum Efficiency and Separation Factor," Appl. Opt. 13, 2505-2511 (1974)