Re: Non-visible-light/IR focusing lenses-Si, Ge, ZiSe?

From: Phil Hobbs (pcdh_at_SpamMeSenseless.us.ibm.com)
Date: 01/14/05 

Date: Fri, 14 Jan 2005 17:14:54 -0500

ZnSe is orange, and ZnS is yellow.

The lenses might be either Si or Ge--they look pretty similar. If I had
it in my lab, I'd sit it in front of my (incandescent) desk lamp, and
check if I could see through it with a 1.3-um IR viewer. If so, they're
all Si. If not, at least one is Ge. You won't want to disassemble it,
but the quite different densities of Si and Ge are another way of telling.

Cheers,

Phil Hobbs

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