List of Tables Contributions of the resonant terms in the equation of motionEq. (4.1) to the LL0 third order polarization P 0 (ω = Ω 0 ) along the ∆t 13 axis (∆t 12 = 0

I ) 4.4 kOe 0 U Frequency(GHz) 50 THURSDAY AFTERNOON / QELS 2002 / 215 QThG24 Fig. 1. spectra [(e)-(h)l. Quantum-beat FID signals for 0, 1.6,3.0, and 4.4 kOe I(a)-(d)l and their Fourier 0 Delay Time 1 (ns) ' 2. Y. Takagi, "Optical spin orientation in aqueous solution of manganese (11) salfdter Opt. Commun.59,122 (1986). 3. Y. Takagi, Y. Fukuda, and T. Hashi, "Optical spin orientation in ruby by Zeeman-selective U-band absorption:' Opt. Commun. 55,115 (1985). 4. T. Endo, and T. Muramota, "Theory of cross relaxation in dilute spin systems," Phys. Rev. B 29,6043 (1984). (b) I@.= 1300ps 0 0 Delay Time t ( ns) 1 QThGZ4 Fig. 2. Decay C U N~ of the opticdlyinduced magnetization (a) in a saturated (0.92 moWI) and (b) in a diluted (0.46 moUI) aqueous solutions of CuSO,.dipole interaction between the copper ions, and it is expected that the decay C U N~ is in the form of e q (-*) with the relaxation rate y.4 The solid C U N~S in Fig. 2(a) and 2(b) are the best fits to the observed ones. The obtained relaxation timer are 340psand 1.3"s for thesaturated snddilutedsolutions, respectively. References 1. J.P. van der Zeil and N. Bloembergen, -Optically induced magnetization in ruby? Phys.