Astigmatism correction for a large-aperture dispersive spectrometer
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- Voropai, E.S., Gulis, I.M. & Kupreev, A.G. J Appl Spectrosc (2008) 75: 150. doi:10.1007/s10812-008-9000-2
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We have numerically modeled astigmatism correction for a large-aperture mirror spectrometer using a tilted plane-parallel plate. The results suggest a decrease in the height of the astigmatic focal spot by a factor of 2–7 over the entire image field without reducing the spectral resolution. We have demonstrated experimentally that the described correction method is feasible on a prototype of a spectrometer. Based on the numerical modeling and experimental data, we have shown that practical application of the method is feasible in order to substantially improve the sensitivity of spectral instruments.