The features of the media acceptable for hologram recording as well as their difference as concerns the recording
mechanism and characteristics are considered. Special attention is paid to the performance of the recording processes in
time domain. The variations occurring during the hologram storage and image reconstruction from the recorded
holograms are also the objects of our attention. The differences in the hologram recording mechanisms and kinetics
allow holographic solving of different problems.
The processes of light-induced thermal field modulation of the optical parameters in the media for photothermic
recording are surveyed. The applicability of the technique for the recording of holograms is considered. Attention is also
paid to the processes involved in the bit-by-bit photothermic and magnetophotothermic recording.
Acousto-optic tunable filters (AOTF), besides their other functions, allow a multispectral processing of images. It
means that AOTFs process the information in time, space, and wavelength domain. The optimization of the information
treatment with the devices requires a specific approach to the metrology. In the present work, the approach, developed
preliminarily for other acousto-optic devices, is extended to AOTF. It is shown that the wavelength selectivity of AOTF
can be defined as a distance between two resolvable spectral lines in which a certain number of gray scale levels can be
recognized with a preassigned probability. The experimental determination of the wavelength selectivity is much more
complicated than the determination of the spatial or temporal selectivities. An apparatus for performing this
complicated task is designed. The results of the measurements are presented.