We report our observation of the photorefractive effect in undoped aluminum nitride. We measured the coupling constant and the formation rate as a function of pump intensity at a wavelength of 405 nm in a two-wave mixing experiment. The photorefractive gain coefficient was 0.47 cm-1 at I = 6.9 W/cm2, and the actual saturated value was probably larger than this. The time constant was 59 ms at I = 1.0 W/cm2. In addition to a refractive index grating, an absorption grating was also formed, which is attributed mainly to an ionized trap density modulation process. 2010 Optical Society of America.
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