The photorefractive effect in a nominally undoped 0.91Pb(Zn1/3Nb2/3)O3-0.09PbTiO3 single crystal is measured. We report what is, to our knowledge, the first observation of the photorefractive effect in Pb-based relaxor ferroelectric crystals. The crystal is grown by the flux solution method. Then it is cut into a 2 mm 4 mm 8 mm piece and electrically poled along the direction. The coupling constant of the two-wave mixing is 17 cm-1, and the normalized time constant under 1-W/cm2 illumination is 12 s at a wavelength of 476 nm. The effective trap density is calculated as 5 1016 cm-3 from the Debye screening length under the assumption of Kukhtarev's band-transport model. The dominant carrier is identified to be holes from the. direction of two-wave mixing energy transfer. 2003 Optical Society of America.
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