What is the best material for my desired reflectivity?

[rasgar]

I need a good reflecting collimation material that is faily cheap and has a reflectivity of about 95% for both infrared and visible light. I know polished aluminum meets the criteria for the infrared, and the fused silica also works well for the visible spectrum, but I need somthing that can collimate both.

 

[Claude Bile]

This has been posted in the General Physics forums.

https://www.physicsforums.com/showthread.php?t=143323

Claude.