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19 August 2005 Dielectric coatings for customised tunable lithium niobate filters
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Narrow bandpass Fabry-Perot etalons are widely used in solar astronomy for spectroscopic imaging. Solid electro-optically tunable filters made of thin, single-crystal lithium niobate are presented in this article. The pass-band is typically ~0.02nm at 550nm. We describe customized corrective and high-reflectivity optical coatings designed and manufactured to tailor the filter for the specific application. Spectral reflectance is calculated to satisfy wavelength requirements and to achieve optimal optical performance. The measured optical thickness of the lithium niobate wafer is an important factor in determining the optimal design of the etalon mirrors. Out-of-band rejection and bandwidth requirements are also taken into account, as well as the influence of the spectral properties of a high-order filter which blocks adjacent etalon orders. Design customization is particularly important in the case of tandem and double-pass etalons.
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Svetlana Dligatch, Roger P. Netterfield, and David I. Farrant "Dielectric coatings for customised tunable lithium niobate filters", Proc. SPIE 5870, Advances in Thin-Film Coatings for Optical Applications II, 58700L (19 August 2005);

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