The GH13-12U is a reflective holographic grating from Thorlabs, measuring 12.7 x 12.7 x 6 mm. This grating is made from Borofloat33, a borosilicate glass known for its excellent thermal shock resistance and low thermal expansion coefficient.
The grating features 1200 grooves per millimeter, providing a high dispersion of 1.22. The front surface of the grating is coated with a specialized coating (tho gh13-12u) for optimal performance. The grating is designed to operate at a wavelength of 588 nm.
The GH13-12U has a rectangular base shape and a grating shape. The orientation vector is along the x-axis, and the grating order is -1. The grating side is the front side, and the grating is available for purchase directly from Thorlabs.
According to the vendor's website, the GH13-12U is currently in stock, making it a readily available option for your optical system needs.