20 September 2007 A filter free dual transmission grating spectrometer for the extreme-ultraviolet
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We report the design and laboratory testing of a prototype dual-grating filter-free extreme ultraviolet (EUV) spectrometer that has potential as a highly stable instrument for measuring absolute solar irradiance in the X-ray through far ultraviolet spectral range. The instrument is based on the same freestanding transmission gratings and silicon photodiodes used on the successful Solar EUV Monitor (SEM) aboard SOHO and the EUV Spectrophotometer (ESP) part of the EVE instrument suite to be flown on SDO. Its two gratings, placed in series, along with a simple baffle structure provide excellent out of band "white" light rejection. Because the instrument does not use any thin film filters or reflective optics it is not susceptible to the degradation and instability associated with such optical elements. We present photometric efficiency data from laboratory tests with a Helium and Hydrogen discharge light source and measurements of "white" light rejection taken using the Mt Wilson Observatory 60' solar telescope.
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Seth R. Wieman, Seth R. Wieman, Leonid V. Didkovsky, Leonid V. Didkovsky, Darrell L. Judge, Darrell L. Judge, Andrew R. Jones, Andrew R. Jones, Matthew Harmon, Matthew Harmon, } "A filter free dual transmission grating spectrometer for the extreme-ultraviolet", Proc. SPIE 6689, Solar Physics and Space Weather Instrumentation II, 66890R (20 September 2007); doi: 10.1117/12.732953; https://doi.org/10.1117/12.732953

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