# I'm working on a project with infrared light and I need materials that are transparent to IR light

I'm going to be using infrared light of wavelength somewhere around $$700-800 \space \text{nm}$$ and I need cheap materials that can be easily found/bought which are transparent to infrared light.

It has to have a solid structure so I can make different shapes which would help in my testing. If I missed some information, please let me know.

• What exactly do you mean by transparent to? – Alaz Jul 17 at 13:30
• Common salt, NaCl, is often used in IR work. – PM 2Ring Jul 17 at 13:40
• Look into polymethylmethacrylate (acrylic plastic, perspex or lucite). It's pretty transparent in the near infrared, and possibly easier to cut and shape than rock salt. – Philip Wood Jul 17 at 13:49
• @TNTCookie, it has to be transparent to infrared light of wavelength 700 - 800 nm – Danush Jul 17 at 14:12
• @PM2Ring, it has to be something rigid, like say cardboard or wood, etc – Danush Jul 17 at 14:15