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Blazed Holographic Concave Grating
Jul 2007
Spectrum Scientific Inc.Request Info
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. 

SSIGratings.jpgAn aberration-corrected concave grating (or flat-field imaging concave grating) has grooves that are neither parallel nor equidistant. This type of concave grating is designed to eliminate astigmatism and allow the required spectral range to be imaged on a plane. This makes the aberration-corrected concave grating ideal for use with planar array detectors such as photodiode arrays or CCD detectors, Spectrum Scientific said.

The 470-250-040 blazed holographic concave grating is ready to ship immediately, the company said. For more information, visit:; e-mail:

Spectrum Scientific Inc.
16692 Hale Ave.
Irvine, CA 92606
Phone: (949) 260-9900
Toll Free: (800) 774-0334
Fax: (949) 260-9902


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A departure from ideal paraxial imaging behavior. The distortion of an optical field wavefront as it is propagated through the elements of an optical system. The field distortion is due to the interaction of the wavefront with ideal components and therefore a result of optical component behavior.
A lens aberration that results in the tangential and sagittal image planes being separated axially.  
Describing a hollow curved surface; curved inward.
A framework or latticework having an even arrangement of rods, or any other long narrow objects with interstices between them, used to disperse light or other radiation by interference between wave trains from the interstices. The ability of a grating to separate wavelengths (chromatic resolving power) is expressed as being equal to the number of lines in the grating.
The technology of generating and harnessing light and other forms of radiant energy whose quantum unit is the photon. The science includes light emission, transmission, deflection, amplification and detection by optical components and instruments, lasers and other light sources, fiber optics, electro-optical instrumentation, related hardware and electronics, and sophisticated systems. The range of applications of photonics extends from energy generation to detection to communications and...
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