The 55-266 is a reflective grating with a rectangular base shape, manufactured by Edmund Optics. This grating measures 30 x 30 x 9.5 mm and is constructed from soda lime ru clear glass. The grating features 2400 grooves per millimeter, oriented in the x-direction, and has an order of -1.
The grating's coating is bare aluminum, specifically Edmund Optics' EDM Diel Bare Al OAP coating, which is applied to the front surface. The grating side is also the front surface. The item's physical data includes a width of 30 mm, a length of 30 mm, and a thickness of 9.5 mm.
This holographic grating is designed for use with visible light, specifically at a wavelength of 588 nm. According to the vendor, it is currently in stock and available for purchase. Further information and purchasing options can be found on the Edmund Optics website via the provided weblink.