Kerr References

[1] G. Rempe et al., Phys. Rev. Lett. 67, 1727 (1991).

[2] J. Gripp et al., Phys. Rev. A 54, R3746 (1996).

[3] J. A. Sauer et al., Phys. Rev. A 69, 051804(R) (2004).