Request InfoSpectrum Scientific Inc. (SSI)Spectrum Scientific Inc. has introduced the 470-250-040 aberration-corrected blaze holographic concave grating. It achieves 85% efficiency at a 250-nm blaze wavelength and features a wavelength range from 190 to 800 nm, a focal ratio of f/2, 21.3-nm/mm reciprocal linear dispersion, a spectral length of 28.7 mm and a 75.86-mm entrance path wavelength. 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