FTIR windows

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Material

waveband (μm)

Refractive Index (at 2 µm)

Properties

Al2O3 (Sapphire)

50-1.65

 

Glass-like

BaF2

67-0.74

1.46

A hard, brittle crystal; insoluble in water; good resistance to fluorine and fluorides; no fog.

CaF2

77-1.11

1.42

A strong crystal; resists most acids and alkalis; withstands high pressure; insoluble in water; no fog.

Ge

5.5-0.6

4.00

A hard, brittle crystal; insoluble in water; well suited for ATR.

KBr

40-0.4

1.53

Very soft, water soluble crystal; low cost and good transmission range; fogs.

LiF

50-1.7

1.4

Best VUV transmitter available

MgF2

75-1.25

 

 

Si

83.3-0.66 0.3-0 (depends on doping)

3.40

A hard and brittle crystal; inert; ideal material for far-IR.

SiO2 (Quartz)

65-2.7

 

A hard crystal, clear in the visible

ZnS 
(Cleartran)

23.800-0.833

 

A water-free form of ZnS

ZnSe

200-0.454

2.40

A hard and brittle crystal; inert; ideal material for ATR.