Abstract
Electron irradiation effects on lithium niobate (LiNbO3) single crystals have been investigated by photoacoustic spectroscopy (PAS), Fourier transform infrared (FT-IR) spectroscopy, and Raman scattering spectroscopy. The photoacoustic signal intensity at 750 nm increase with increasing electron electron fluence. The OH- absorption spectra in the IR region are used to examine the defect structure of LiNbO3. The absorption spectra are almost the same at electron fluencies below 5 ×1017/cm2. We found that the influence of the electron irradiation was different between the mirror-polished side and the as-sliced side, as determined from the Raman spectra. There was no change in the Raman spectra on the mirror-polished LiNbO3 surface side. The control of the composition is most important to avoid the effects of electron irradiation.
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