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- W235687597 abstract "Abstract : The mobility of photoexcited charge carriers in photorefractive insulators can be measured with a holographic time-of-flight technique. By illuminating the crystal with two interfering 30 ps laser pulses at the wavelength of 532 nm, we create an instantaneous sinusoidal pattern of photoexcited charge carriers. A strong electric field E sub 0 is applied across the crystal causing the sinusoidal pattern of charge carriers to drift with a velocity muE sub 0 where mu is the mobility. With a proper choice of the interference fringe spacing alpha, the superposition of this drifting charge pattern on the complementary pattern of photo-ionized traps creates an observable oscillating space charge field. We probe this oscillation by diffracting a weak cw helium-neon beam from the refractive index grating that is created via the electro-optic effect. The period Pt of the observed oscillation is the time required for photoexcited charge carriers to drift over one spatial period A. A time-flight mobility mu can therefore be simply determined using the equation." @default.
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- W235687597 date "1992-05-22" @default.
- W235687597 modified "2023-09-27" @default.
- W235687597 title "Conduction Band and Trap Limited Mobilities in Bi sub 12 Sio sub 20" @default.
- W235687597 hasPublicationYear "1992" @default.
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