Abstract
We have investigated the feasibility of using a barium titanate crystal as a unidirectional device. The nonlinear interaction between a beam and its own reflection from the back face of the crystal causes an effective increase or decrease in the transmission through the crystal, depending on whether the incident beam propagates along or against the crystal c-axis, respectively. This effect was investigated for several wavelengths and compared with theory. It is possible to make a device that has an average transmission of ≈94% and a transmission asymmetry of 1% by using a crystal whose front and back faces are cut so that their normals are at angle of ≈30° to the crystal c-axis.
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