Aberration-reduced holographic spherical gratings for Rowland circle spectrographs

Physics – Optics

Scientific paper

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Aberration, Gratings (Spectra), Holography, Rowland Circles, Ultraviolet Spectrometers, Degrees Of Freedom, Far Ultraviolet Radiation, Spectral Resolution

Scientific paper

A numerical minimization method is used to design a Rowland holographic spherical grating that is recorded with two stigmatic laser sources. The method aims at simultaneously reducing all aberrations up to fourth order over a significant spectral range. In the context of a high spectral resolution, far-ultraviolet spectrograph, an original solution is found that implies a nonclassical recording geometry with one virtual source. This solution satisfies the requirement of a resolving power of about 30,000 with the unquestionable advantage of manufacturing and testing simplicity. Finally, another example, which is obtained in a different context, shows that the properties of this recording geometry probably have a general applicability.

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