The findings of investigation and applications of transmission volume phase gratings as dispersion - selective units of the frequency-tuned laser cavities are presented. The single-mode oscillation on dyed polymer laser with a new cavity configuration has been carried out. It is shown the holographic volume gratings due to the intrinsic spectral - angular selectivity in opposite to relief clones, at equal angular dispersions make possible to implement laser cavities where the oscillation line-width and beam divergence are less on the order of value in the reference to the similar parameters in reflection relief cavity. The delivered expression for the spectral resolution power of volume gratings shows last does not depend in opposite to relief clones on the transversal size of an incident light beam. The main features of photopolymer volume gratings that is essential for their applications in applied spectroscopy are described and discussed.
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