The exposure sensitivity and polarization sensitivity of spiropyran doped polymers after the irradiation in short-wavelength range were significantly improved.Based on such properties,holographic grating recordings accompanying with a linearly polarized blue-violet beam(405nm)in the photochromic film were performed by two coherent green beams(532nm)for s-p formation.Under the bi-photonic action of 405 nm and 532 nm,temporal evolution of diffraction efficiency was strongly dependent on auxiliary light intens...
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