What materials are used in 43mm IR camera lens filters?

[Ermak_S]

Hello everyone!

What materials are used for making optical filter glasses?

I bought this:

http://www.alibaba.com/product-gs/495852853/Digital_Camera_lens_43mm_950nm_IR.html

and took its transmission spectrum. So, it reminds me a transmission spectrum of CdTe.

But a-CdTe is more fragile.

 

[Alkim]

Not sure, but could be this one.