Simultaneous writing and probing of photoinduced second-order susceptibility Χ~((2)) in an azo-dye polymer thin film is demonstrated. The method is based on the fact that tensor properties of Χ~((2)) provide different planes of polarization for seeding and signal second harmonics. Our technique allows the Χ~((2)) value to be monitored in real time, completely eliminating the distortion of optical poling that can occur in traditional probing configurations. The possibility of attaining high values of Χ~((2)) in a DR1-PMMA guest-host system under low seeding intensities is shown.
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