Iron-doped tetragonal potassium tantalate-niobate (KTN:Fe) crystals are used as photorefractive storage media for holographic double-exposure interferometry. Holographic recording in the investigated crystals is influenced by thermal treatments. Deformations of a diffusely reflecting test target are observed with the help of holographic interferograms utilizing a phasestepping technique.0925-3467/95/$09.50
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