This optical component is a reflective grating, sourced from the reputable vendor, Edmund Optics. It is a rectangular grating, with dimensions of 12.5 x 12.5 x 6 mm, and is made of soda lime ru clear glass. The grating features high performance, with 1200 grooves per millimeter and a blaze wavelength of 900 nm.
The grating's coating is bare aluminum, specifically Edmund Optics' EDM Diel bare aluminum OAP coating, which is applied to the front surface. The blaze angle is 32.7 degrees, and the orientation vector is along the x-axis. The grating order is -1, and the grating side is the front side.
According to the vendor's website, this item is currently in stock. For more detailed information, you can refer to the provided weblink: https://www.edmundoptics.com/p/1200-groves-125-x-125mm-900nm-high-performance-reflection-grating/37285/.