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The theoretical consideration of the readout system for the photochromic optical disk

The data are stored in the alternative pits and lands for present optical disk, which is similar to the grating. Accordingly, the grating theory becomes the basis theory for the optical disk. The work presented in this paper focused on several aspects of the following: outlining the optical disk models adopted by the theories in print, analyzing the foundation basis of the models, and bringing forward a model which can be used for the new-fashioned optical storage, multi-wavelength photochromic optical storage. The classical scalar diffraction theory supposed that the effects of the optical disk on the incident beam were introducing the local phase delay that could be described by the optical path difference Δs, and the energy of the incident beam would not be absorbed. The two equations could respectively express the difference of the optical path: (1) Δs=n*Δh and (2) Δs=Δn*h. As the result of the analysis, we concluded that the tradition optical disk model fit for pit-land recording format and the cavity or bubble recording format. For the photochromic optical disk, the recording material, which absorbed the energy of the incident beam, was similar to the amplitude grating. The diffraction theory of this system was presented, and the equations for the readout signal were educed.