Abstract
High reflectivity lead-salt Bragg mirrors were grown by molecular beam epitaxy on BaF 2 (1 1 1) substrates. The quarter wavelength layer pairs consisted of a low refractive index Pb 1− x Eu x Te layer with x Eu=6% and a higher refractive index pseudoalloy PbTe/Pb 1− x Eu x Te superlattice with average x Eu of 1%. Mirrors with stop bands in the range between 4 and 6 μm were obtained with reflectivities as high as 99% for mirrors with 32 λ/4 pairs.
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