Abstract
The z-cut LiTaO3 single crystals were irradiated by 6 MeV Xe-ion at the fluences in the range from 1.0 × 1012 to 1.0 × 1015 ions/cm2, or 30, 375, 1980 MeV Kr ions at the fluences in the range from 1.0 × 1011 to 1.0 × 1013 ions/cm2. The irradiated samples were analyzed by optical spectrometer and Rutherford backscattering-channeling spectroscopy. It was found that the UV absorption edge of LiTaO3 shifts toward to longer wavelength (red-shift) as a result of heavy-ion irradiation. In 6 MeV Xe-ion irradiated samples, the red-shifts are weak even at a high fluence of 1.0 × 1015 ions/cm2 when the irradiated layer becomes amorphous. However, in 30, 375, 1980 MeV Kr-ion irradiated samples, significant red-shifts were observed even at low fluences. The effects of nuclear energy loss and electronic energy loss on the red-shift of absorption edge in LiTaO3 are discussed.
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