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A series of reduced barium titanate crystals were made. By investigation of the dark-conductivity, we find that the compensation point should be located between 10−8 atm and 10−12 atm. The measurements of the intensity-dependent two-beam coupling gains were performed for the crystals reduced at 10−8 atm and 10−12 atm. The electron-hole competition of the crystal reduced at 10−8 atm was found to strongly depend on the wavelength.
© 2003 Optical Society of America
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