We report the first direct measurement of the grating phase shift evolution during white light illumination for the development of a fixed grating in an Fe-doped lithium niobate crystal. Stabilized holographic recording is shown to be essential to enable the present measurements. Experimental data are in good agreement with theory and allow computing relevant material parameters for the sample under anal ysis. The results here reported are of the upmost relevance for understanding the advantageous behavior of oxidized samples in hologram fixing.

© 2003 Optical Society of America

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