Abstract
Real-time recording of mid-infrared laser radiation in photochromic spiropyran-MMA copolymer materials is investigated. The laser radiation, derived from a CO<SUB>2</SUB> laser, bleached pre-colored merocyanine, thereby converting it back to spiropyran. The exposure sensitivity at 50 percent of the initial merocyanine optical density was about 0.1 J/mm<SUP>2</SUP> at 10.6 micrometers laser wavelength and 0.2 J/mm<SUP>2</SUP> at 10.5 micrometers . The difference of sensitivity at the two laser wavelengths points to differences in thermal energy dissipation mechanisms. The characteristics and examples of imagery, recorded in these photochromics, are presented. A resolution equal or better than 40 lines/mm was achieved.
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