Applied Physics Letters · 1990 · 17 citations · 10 references
Natural SciencesMaterials SciencePhysicsCondensed Matter PhysicsOptical MaterialsOpticsInfrared Optical MaterialsNonlinear Optical MaterialsNonlinear OpticsOptical Properties Of MaterialsOptical Thin FilmsThin Film Optical PropertiesFour-wave MixingInfrared Nonlinear Optical MaterialsMolecular Beam EpitaxyNonlinear Optical PropertiesNonlinear Optical ResponseNonlinearityOptical PropertiesReflectivity
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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