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AMTIR 2
Amtir 2, an arsenic
selenium glass, was developed at Amorphous Materials in 1980 while
working with NVL at Ft. Belvoir. A shortage of germanium had
developed which resulted in a dramatic increase in the price of
germanium and the cost of producing Amtir 1. Amtir 2 at that time was
difficult to fabricate into lens blanks. AMI has not strongly
recommended its use in the past for that reason. Now, we have entered
a period of germanium price instability again. Recent developments in
fabrication techniques at AMI have demonstrated we can now fabricate
Amtir 2 blanks as well as our other glasses. The production process of
the glass is now well established and the refractive index measured
again this year. The glass has a low
DN/DT in both the 3-5
mm and the 8-12
mm bands. Optical Homogeneity
is better than that of Amtir 1. We now strongly recommend its use in
new infrared systems. |