Abstract
Both the spatial and temporal evolutions of photorefractive (PR) grating formation by field-induced enhancement in Mn:Fe:KTN crystal are visualized in situ and estimated quantitatively by means of digital holographic microscopy. A series of sequential phase maps are retrieved numerically from the recorded digital holograms to explore the quantitative characteristics of the observed procedure. Further investigations reveal that the properties of PR grating, i.e. amplitude of index modulation and writing time of the grating, can be improved drastically by an external field. The improvement PR grating is attributed to enhanced space-charge fields induced by an external field. This effect can be of interest for many relevant applications, such as electroholographic switching, and in situ and real-time monitoring of both the grating structure and its refractive index profile.
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