We investigate, both theoretically and experimentally, the cross-Kerr nonlinearity generated in a four-level tripod system in the ${}^{87}\mathrm{Rb}$ D1 line. The system exhibits simultaneous electromagnetically induced transparency (EIT) windows for two weak (probe and trigger) fields and the enhanced cross-Kerr nonlinearity by EIT. The cross-Kerr nonlinear phase shifts for probe (trigger) field are measured at several different intensities of trigger (probe) field. The results show that large cross-phase modulation (XPM) coefficients can be achieved at low light intensities.

© 2009 Optical Society of America

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