Geometric theory of double monochromator

Elena A. Sokolova

doi:10.1117/12.368220

5 October 1999 Geometric theory of double monochromator

Elena A. Sokolova

Proceedings Volume 3779, Current Developments in Optical Design and Optical Engineering VIII; (1999) https://doi.org/10.1117/12.368220
Event: SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, 1999, Denver, CO, United States

Abstract

The double monochromator is a system of two single monochromators, in which the exit slit of the first monochromator is the entrance slit of the second one. We can use the double monochromator if we want to decrease the scattering light level or increase the dispersion of the spectral device. In the adding dispersion double monochromator all aberrations add. The traditional way of optimization of the double monochromator parameters is the two concave diffraction gratings, in which the second single monochromator particularly compensates the defocusing, the meridional coma and the first order astigmatism of the first one. Calculation of this monochromator have been done using numerical methods. More compete optimization of the optical mounting of spectroscopic device consists of two diffraction gratings can be done using light path function consideration. Geometric theory of two - steps recorded grating have been developed for holographic gratings recording. In this paper this theory is expanded for the case of double monochromator. The developed theory gives possibility for more complete aberration compensation, which allows to increase the spectral and the spatial resolution as well. Improvement of spectral and the spatial resolution is actual for different types of spectroscopic deices, for example, for the plasma diagnostic spectrometers.

Citation Download Citation

Elena A. Sokolova "Geometric theory of double monochromator", Proc. SPIE 3779, Current Developments in Optical Design and Optical Engineering VIII, (5 October 1999); https://doi.org/10.1117/12.368220

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