We show that a constant component of the holographic current may emerge in photorefractive crystals even in the absence of an applied electric field if the recording pattern is oscillating in a definite law. We derive conditions on the oscillations for the effect to appear. For instance, a fringe pattern with an intensity I ~ 1 + m cos[kx + Δcos ωt + δ cos(2ωt + φ)] is fitted (here x is a linear coordinate, t is time, and m, k, ω, and φ are constants). In this case the dc component is j0 ~ −sin φ. One can detect the relative phases of the harmonics by this means.
© 1993 Optical Society of America
Original Manuscript: May 14, 1993
Published: October 15, 1993
V. V. Bryksin, S. N. Dorogovtsev, and L. I. Korovin, "Initialization of the holographic current constant component by recording pattern oscillation in photorefractive crystals," Opt. Lett. 18, 1760-1762 (1993)