I'm looking for a solid material that will diffuse light throughout it. In particular I would need a thin bar with a light source at one end that will diffuse light to all sides of the bar, however, I don't specifically need a bar as long as the material can be machined. I'm trying to search for some type of material like this, but I guess I really don't know what kind of terminology to be using and I keep ending up finding only cinematography light filter films. If anyone has any idea of the material I'm looking for or just the proper terminology of what I should be searching for let me know. Thanks for your time!