Zq. Wang et al., HOLOGRAPHIC-RECORDING IMPROVEMENT IN A BISMUTH SILICON-OXIDE CRYSTAL BY THE MOVING-GRATING TECHNIQUE, Applied optics, 33(32), 1994, pp. 7627-7633
We investigate the enhancement of the diffraction efficiency of dynami
c gratings recorded in a bismuth silicon oxide crystal at large modula
tion by the moving-grating technique. The optimum fringe velocity for
maximum diffraction efficiency and the degree of enhancement of the di
ffraction efficiency at optimum fringe velocity are experimentally fou
nd to be dependent on the fringe modulation. We apply this technique t
o real-time incoherent correlation using bismuth silicon oxide. There
are two main advantages in using moving gratings: First, the signal-to
-noise ratio can be improved considerably because of the improved diff
raction efficiency. Second, the resonant effect reduces the effect of
environmental disturbances on the peak-correlation intensity, which is
significant when the threshold detection level of the correlator is s
et.