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Photorefractive Materials For Optical Signal Processing, William B. Lawler
Photorefractive Materials For Optical Signal Processing, William B. Lawler
Retrospective Theses and Dissertations
The optical response of the photorefractive crystals KNbO3:Ta, KNbO3:Fe, LiNbO3:Fe, and nominally pure BaTiO3 is investigated. In the experiment, a holographic grating is built in the crystal under investigation via a two-wave mixing scheme that utilizes the signal-processing capacities of two acousto-optic Bragg cells. The dynamic interaction of the Bragg cells with the photorefractive grating causes a heterodyned RF signal to appear on the output laser beam, enabling the real-time, direct measurement of the amplitude and phase of the space-charge fields in the crystal. Experimental results are presented for the amplitude and phase …