Large transparent specimens of polycrystalline zinc oxide with c-axis orientation prepared by the vapor transport method are submitted to open-aperture Z-scan measurement at 532nm. The effective two-photon absorption coefficient βeff of the polycrystalline ZnO is determined to be 8.6±1.4cm/GW. Optical power-limiting behavior associated with the two-photon absorption is observed clearly in the polycrystalline ZnO of 0.95mm thick under the incident beam irradiance of interest.
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Nakazawa et al. (1996) studied this question.
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