The collision-enhanced Zeeman coherence ρ_((ω1-ω2))^((2)) has been demonstrated by the effect of optical field induced index of refraction change,which is described by the real part of the nonlinear susceptibility χ_((-ω1,ω1-ω2,ω2))^((3)).The experiments are performed in sodium vapor by a Mach-Zehnder interferometer.The dependences of the effect on the magnetic field,pump beam intensity,and Ar pressure are consistent with the theory.
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