Real structure of growing crystal is strongly defined by growth conditions. We suggest new method of investigation of optical homogeneity of oxide crystals. The method is based on observation of optical images of the samples formed in two-wave mixing scheme under holographic amplification in photorefractive crystals.

At present work real structure of crystals grown by Czochralski method and modified Stepanov technique was studied. The peculiarities of micro- and macromorphology and their dependence on the growth conditions were investigated for crystals with scheelite structure (calcium, strontium, barium tungstates and molybdates) and tetragonal tungsten bronze structure (strontium-barium niobate solid solutions).

The method of non-destructive control of optical quality for the transparent materials provides the observation of very thin structure inhomogenities which could not be observed by conventional methods.

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