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Photonics Handbook

Coefficients of Expansion and Densities of Optical Materials

  
   Material

Coefficient of Expansion
(×10–6 per °C)

Density
(lbs/cubic in.)

Aluminum

23.8

0.10

Brass (cast)

18.8

0.30

Carbon (diamond)

  1.2

0.25

Carbon (graphite)

  7.9

Copper

16.2

0.32

Germanium

  5.9

0.20

Glass (optical)

    maximum

15.0

0.22

    minimum

  4.0

0.08

    average

  8.0

0.11

Gold

14.0

0.70

Invar (36% Ni)

  0.9

0.30

Iron (cast)

10.0

0.27

Iron steel

13.2

0.28

Lead

28.0

0.41

Magnesium (cast)

27.0

0.06

Nickel

12.6

0.32

Plastics (optical)

65.0

0.04

Platinum

  9.0

0.77

Pyrex

  3.5

0.10

Quartz, fused

  0.6

0.08

Rubber (hard)

80.0

0.04

Silicon

2.33

0.08

Steel, stainless

12.0

0.30

Zinc sulfide (ZnS)

  7.9

0.15

Zinc selenide (ZnSe)

  7.6

0.20


Source: Walker Associates
GLOSSARY
optical materials
Materials that, by virtue of their optical characteristics (i.e. refractive index, dispersion,  etc.), are used in optical elements. See crystal; glass; plastic lens.
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