Request InfoSpectrum Scientific Inc. (SSI)A range of blazed concave holographic gratings has been launched by Spectrum Scientific Inc. They achieve efficiencies as high as 80% and, the company says, produce low stray light. Fabricated via a proprietary technique that does not use ion etching, the gratings are suitable for use in such analytical instruments as UV/VIS spectrophotometers and flat-field imaging spectrographs. 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