Analysis of Temperature Modes of Hologram Recording on Photothermoplastic Materials
Theoretical study of the process of hologram recording on photothermoplastic media
in which a linear relationship between the change in the refractive index and the
temperature expansion of the medium is assumed. The results of the study allow us
to estimate the required laser radiation power for the information recording as the
function of the spatial frequency and the radiation exposure duration.
A solution was found for the heat conduction equation for photothermoplastic
materials heated by an interference laser field. The solution obtained allows us
to determine the required value of the recording temperature for given spatial
frequencies, depending on the thermophysical parameters of the medium, and also
on the power and duration of the heating radiation.The use of the results of the study made it possible to find analytical expressions for the dependence of the diffraction efficiency of thermal gratings on the spatial frequency, pulse duration, and thermophysical parameters of the medium. It is established that to increase the recording density in these media, materials with a low thermal diffusivity are necessary, while recording should be performed by the short pulses to minimize the length of thermal diffusion.
Keywords: Diffraction efficiency; Hologram; Photothermoplastic materials; Temperature; Heating
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