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The spatial correlation length between nonlinear optical chromophores has been determined using femtosecond hyper-Rayleigh scattering. This correlation length corresponds to the effective interaction length for frequency doubling in waveguide derived from phase-matching curve. The temporal characteristics of this correlation length was studied and compared with thermal relaxation time, which was obtained with coherent second-harmonic intensity. This indicated that the efficiency of a second-order waveguide process could decay much faster than generally anticipated.