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Photoinduced changes of refractive index (PCI) in nonpolar PLZT is attributed to photoconductivity at the wavelength λ = 488 nm. Optical measurement of PCI profiles suggests that average photocarrier drift length is 〈ℓ〉 ≃ 0.8 μm and they are positively charged.
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Rouchon et al. (1976) studied this question.
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