Nonlinear optical properties of molecular beam epitaxy grown Bi1−xSbx

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Abstract
We discuss the first investigation of Bi1−xSbx as an infrared nonlinear optical material. Nondegenerate four‐wave mixing experiments at CO2 laser wavelengths yield a large nonlinearity (χ(3)≊3×10−4 esu) which does not saturate at power densities up to 0.5 MW/cm2. Both the ambient and substrate interfaces of the film are highly reflective and the étalon they form is found to have a large effect on the transmission and reflectivity spectra of the as‐grown films. This suggests the possibility that constructive interference of the film’s internal optical fields could be used to considerably enhance the nonlinear signal.

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