Request InfoSpectrum Scientific Inc. (SSI)IRVINE, Calif., July 17, 2007 -- Spectrum Scientific Inc. said its new aberration-corrected blazed holographic concave grating, 470-250-040, has the world's highest efficiency, measuring at 85 percent at the 250-nm blaze wavelength. The wavelength ranges from 190-800 nm for the grating. With a focal ratio of f/2, it offers one of the highest numerical apertures available today with the lowest stray light, the company said. An aberration-corrected concave grating (or flat-field imaging concave grating) has grooves that are neither parallel nor equidistant. 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