Labsphere Uncooled Laser Power Measurement Sphere
Labsphere Laser Power Measurement Spheres are ideal for collecting the total radiant power emitted by highly divergent sources, such as laser diodes as well as a collimated laser beam. Accurate, repeatable measurements may be performed quickly and easily without painstaking positioning and alignment procedures. Integrating sphere measurements of laser power also eliminate polarization effects often associated with filter attenuation techniques.
https://www.labsphere.com/site/assets/files/2609/pb-14008-000_rev_02_no_cooling.pdf