Optimum grating parameters for a VUV spectrometer    

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The object of the invention is to provide manufacturing parameters for a holographic diffraction grating on a concave or toroidal surface, which is used as the single optical element in a VUV spectrometer with a flat detector. The spectrometer geometry is also defined alongside the diffraction grating parameters. The invention from the research center Juelich (Germany) consists of a proprietary software code which uses various numerical methods to determine the optimal grating parameters, with the aim of producing such gratings for VUV spectrometers with  a  minimal  line width  for  a  pre-­‐defined  wavelength  and  at  the  same  time achieving high spectrometer efficiencies.


The invention is based on a software code that determines manufacturing parameters for an optimized holographic diffraction grating on a concave or toroidal surface, together with the geometry of the corresponding VUV spectrometer arrangement (entrance slit, grating and detector). The method described contains the numerical determination of the full parameter set for the grating and the spectrometer. The offer focuses on providing optimum grating parameters for the production of spectrometers. Such parameters are made available through licensing.


Innovation & Advantages

The method described above leads to accurate gratings with the ability to provide sharp spectrometric images at high efficiency and low stray light level. This could not be achieved by mechanically ruled gratings or by holographic gratings on flat surfaces.