Journal of the Optical Society of America B: Optical Physics

Detection of sharp absorption lines in thin NdF3 films

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We report the use of a sensitive spectrometer system for studying sharp optical absorption lines that are dueto transitions between 4f3 crystal-field levels of Nd3+ in epitaxial NdF3 films. Films as thin as 50 Å on GaAs substrates displayed absorption lines with asymmetric line shapes. Samples with an antireflecting LaF2 buffer between the NdF3 layer and the substrate permitted observation ofabsorption lines in thinner films. © 1991 Optical Society of America.