This is a GR1325-07106 Mid-IR Ruled Reflective Diffraction Grating from Thorlabs, designed for use in the mid-infrared spectrum. The grating is made of hard glass, specifically Pyrex, which is known for its excellent thermal stability and resistance to thermal shock.
The grating has a size of 12.5 x 25 x 9.5 mm, making it suitable for a variety of optical systems. It features 75 grooves per millimeter, which is a high groove density that can provide high resolution and dispersion. The blaze wavelength of this grating is 10600 nm, which is in the mid-infrared region, and it has a blaze angle of 21 degrees.
The grating is coated on the front side with a specific coating (tho gr1325-07106) that enhances its performance in the mid-infrared region. The orientation vector of the grating is in the x-direction, and it is designed to operate in the -1st order.
The grating is in stock and available for purchase from Thorlabs. For more information, you can refer to the vendor's website at https://www.thorlabs.com/thorproduct.cfm?partnumber=GR1325-07106.