Abstract
We have studied theoretically the effect of the probe-beam size on time-delayed laser-induced double gratings by assuming that the probe beam is described as a Gaussian beam. LettingE s1 andE s2 be the Four-Wave Mixing (FWM) signals originating from the diffraction of the probe beam by the gratings, the condition for the occurrence of the FWM signal modulation is that the divergence angle ofE s1 andE s2 is larger than half of the intersection angle between the propagation directions ofE s1 andE s2. We have also proposed methods to increase the modulation contrast.
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