Wavelength modulation spectrometer for studying the optical properties of solids in a wide range of light energy

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Abstract
A wavelength-modulated spectrometer usable for reflectivity measurements between 150 nm and 900 nm is described. The chopped double-beam, single-detector system measures conventional and derivative spectra simultaneously. The cancellation of spurious derivative signals due to the modulated incident light is performed by an electronic servo-loop using multiplier modules. The direct and modulated reflectance spectra of cubic ZnS between 165 nm and 360 nm are given.