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The time, temperature, and impurity-concentration dependences of the formation and relaxation of phase holograms in iron-doped lithium niobate were determined. A volume phase holographic grating with a period of 0.69 μ and a thickness of 14 mm was characterized by an angular selectivity of 22 " and a spectral selectivity of 1.36 Å.
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Barkan et al. (1979) studied this question.
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