Prism coupling of an argon laser into a ZnS waveguide was investigated for power slew rates much less than the nonlinearity relaxation time. The asymmetries and switching as a function of coupling conditions predicted by Carter and Chen1 are demonstrated clearly for the first time, we believe. In addition we also observed increasing absorption bistability2 in conditions consistent with the angular switching results but different from those in which bistability has been previously reported in ZnS waveguides.3

© 1987 Optical Society of America

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