Abstract

The reflection and transmission of fifteen commonly used infrared optical materials have been measured to 50 μ with a Beckman IR-7 with CsI optics. Using these reflection properties, small inexpensive reststrahlen filters have been constructed. By applying a fine grind to reststrahlen plates, it is shown that stray light can be reduced in far-infrared instruments.

© 1963 Optical Society of America

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Figures (17)

Fig. 1
Fig. 1

NaCl, 5 mm.

Fig. 2
Fig. 2

KBr, 5 mm.

Fig. 3
Fig. 3

CsBr, 1 cm.

Fig. 4
Fig. 4

CsI, 1 cm.

Fig. 5
Fig. 5

Quartz, 1 cm.

Fig. 6
Fig. 6

LiF, 5 mm.

Fig. 7
Fig. 7

CaF2, 5 mm.

Fig. 8
Fig. 8

Sapphire, 2 mm.

Fig. 9
Fig. 9

As2S3, 5 mm.

Fig. 10
Fig. 10

AgCl, 0.5 mm.

Fig. 11
Fig. 11

KRS5, 2 mm.

Fig. 12
Fig. 12

Irtran 1, 2 mm.

Fig. 13
Fig. 13

Irtran 2, 1 mm.

Fig. 14
Fig. 14

Silicon, 1 cm.

Fig. 15
Fig. 15

Germanium, 1.6 mm.

Fig. 16
Fig. 16

Reflection filters.

Fig. 17
Fig. 17

Effect of grinding on surface reflection.

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