Charge transport processes in LiNbO3:Fe at high intensity laser pulses |
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Authors: | F. Jermann E. Krätzig |
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Affiliation: | (1) Fachbereich Physik, Universität Osnabrück, W-4500 Osnabrück, Fed. Rep. Germany |
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Abstract: | Light-induced refractive index changes in LiNbO3:Fe crystals are investigated at high light intensities (>109 Wm–2). Holographic gratings are recorded and erased with frequency-doubled pulses of a Q-switched Nd:YAG laser. We find new intensity dependent contributions to the holographic sensitivity, to the photoconductivity, and to the saturation value of refractive index change. Light-induced absorption changes are also detected. These results indicate that the Fe2+/Fe3+ charge transport model, well established for low intensities, has to be modified for high intensities by assuming additional centers which trap and supply electrons. |
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Keywords: | 42.40 42.70 78.20 |
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