Multimedia Gallery
Volume phase holographic (VPH) grism
A volume phase holographic (VPH) grism, a combination of a diffraction grating and a prism. This grism combines a grating from Kaiser Optical Systems Inc. with prism wedges from Janos Technology Inc., and was assembled at the National Optical Astronomy Observatory (NOAO) by Al Camacho and Heidi Yarborough. It is used in the new Multi-Aperture Red Spectrometer (MARS, which is CryoCam resurrected).
For more information, see the September 2001 NOAO Newsletter, available Here. (Date of Image: Unknown)
Credit: NOAO/AURA/NSF
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