This is a 33025FL01-330R 12.5 x 12.5 x 6 mm Float Glass Plane Ruled Diffraction Grating, featuring 1200 grooves per millimeter and a coating of nwr 53-330r-1264-1p on the front. The grating is sourced from the reputable vendor MKS/Newport, and detailed information about the product, including its current availability and price, can be found on their official website at https://www.newport.com/p/33025FL01-330R.
The grating is a Blazed Ruled Reflective type with a base shape of a rectangle. Its physical dimensions are 12.5 mm in width, 12.5 mm in height, and 6 mm in thickness. The grating has no inner or outer radius, and it is made of soda lime ru clear material.
The wavelength of this diffraction grating is 588 nm, and it is designed to optimally function at the blaze wavelength of 400 nm with a blaze angle of 14 degrees. The orientation vector of the grating is (1, 0, 0), and it is intended for use with the grating side facing the front. The order of the grating is 1, and it has 1200 grooves per millimeter.