This is a 33025FL01-010R 12.5 x 12.5 x 6 mm Float Glass Plane Ruled Diffraction Grating, available from MKS/Newport. The grating, which is 12.5 mm in width and height and 6 mm in thickness, is a Blazed Ruled Reflective Grating with a Sub Type of Rectangular.
The grating is made of soda lime ru clear material and features a coating of nwr 53-010r-1092-1 on the front side. It has a blaze wavelength of 300 and 600 grooves per millimeter, with a blaze angle of 5.2 degrees. The orientation vector is along the x-axis, and the grating order is 1.
The grating is designed to operate at a wavelength of 588 nm, and the vendor, MKS/Newport, confirms that it is in stock and available for immediate purchase. The grating's physical data, including its blaze wavelength, grooves, blaze angle, orientation vector, order, and grating side, make it a versatile and high-performing optical component.