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DR1(4-[N-ethyl-N-(2-hydroxyethyl)]amino-4′-nitro-azobenzene)-doped poly(methyl methacrylate) and DR1-doped silica gel thin films were optically polarized by the coherent superposition of the 1500 nm fundamental and the 750 nm second-harmonic light of a 130 fs pulse laser. These films were successfully polarized and saturated in 2 min, despite the transparent seed beams’ wavelength for the dye. The mechanism of the optical poling likely occurred in such a way that a multiphoton absorption and a photoisomerization of DR1 induced a polarized structure in the films. © 1999 American Institute of Physics.
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