One Way Viewing Through Photorefractive KnbO3

M. Z. Zha; P. Gunter

doi:10.1117/12.943655

27 March 1985 One Way Viewing Through Photorefractive KnbO₃

M. Z. Zha, P. Gunter

Proceedings Volume 0492, 1984 European Conf on Optics, Optical Systems, and Applications; (1985) https://doi.org/10.1117/12.943655
Event: 1984 European Conference on Optics, Optical Systems and Applications, 1984, Amsterdam, Netherlands

Abstract

Nonreciprocal light transmission through a photorefractive medium is a consequence of the asymmetric self-diffraction at the photoinduced grating produced by two antiparallel beams. We report for the first time one way viewing experiment with KNbO₃ as the nonlinear, photorefractive medium. By illuminating the one way device with two antiparallel beams of equal intensity P = 10 mW (I = 19 W/cm4) the light transmission factors were 113% and 59% for the two beams, i.e. the transmissivity in the first case is larger than unity despite of an absorption constant of α = 1.5 cm^-lx The grating build-up time was 1.7 seconds at this power level and 0.1 second at 270 W/ce. The transmission asymmetry caused by the non-linear interaction between a beam and its own reflective from the back face of the crystal was investigated for several wavelengths X. We measured 57% and 27% for two antiparallel beams at X = 514.5 nm with an optimized crystal cut with light propagation direction 37' to the b-axis and perpendicular to the a-axis.

Citation Download Citation

M. Z. Zha and P. Gunter "One Way Viewing Through Photorefractive KnbO₃", Proc. SPIE 0492, 1984 European Conf on Optics, Optical Systems, and Applications, (27 March 1985); https://doi.org/10.1117/12.943655

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