The MPD244-P01 from Thorlabs is an Off-Axis Parabolic Mirror with an off-axis angle of 45 degrees. The mirror has a reflected focal length of 101.6 mm and a parent focal length of 86.7 mm. It has a diameter of 2 inches and a thickness of 1.5 inches. The OAP mirrors are fabricated using aluminum substrates, and the diamond-turned parabolic surface has a protected silver coating that provides more than 97.5% average reflectance from 450 nm to 2 µm and more than 96% average reflectance from 2 µm to 20 µm. The bottom of each mirror has three 8-32 tapped mounting holes in a triangle pattern and an alignment hole for use with a mounting adapter.