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4.5 Mirror Substrate Materials

Tables adapted from Palmer, J. M., Properties of metals, in Handbook of Optics, Vol.II (McGraw-Hill, New York, 1995), p. 35.11.

Mirror Substrate Materials

 

Density

Young’s modulus

Specific stiffness

Material

(g/cm3)

(GN/m2)

(arbitrary units)

Fused silica

2.19

72

33

Beryllium (I-70)

1.85

287

155

Aluminum (6061)

2.70

68

25

Copper

8.94

117

13

Stainless steel (304)

8.00

193

24

Invar (36)

8.05

141

18

Silicon

2.33

131

56

Silicon carbide (30% Si)

2.89

330

114

Silicon carbide CVD)

3.21

465

145

 

 

 

 

Thermal Properties of Substrate Materials

 

Coeff. linear

Specific heat

Thermal

Thermal

 

expansion

capacity

conductivity

diffusivity

Material

(106 K-1)

(J/g K)

(W/m K

(10-6 m2/s)

Fused silica

0.50

750

1.4

0.85

Beryllium (I-70)

11.3

1925

216

57.2

Aluminum (6061)

22.5

896

167

69

Copper

16.5

385

391

115.5

Stainless steel (304)

14.7

500

16.2

4.0

Invar (36)

1.0

515

10.4

2.6

Silicon

2.6

710

156

89.2

Silicon carbide (30% Si)

2.6

670

155

81.0

Silicon carbide CVD)

2.4

733

198

82.0

 

 

 

 

 

Thermal Distortion of Substrate Materials

 

Steady state

Transient

Material

distortion coefficient(a) ( m/W)

distortion coefficient(b) (s/ m2 K)

Fused silica

0.36

0.59

Beryllium (I-70)

0.05

0.20

Aluminum (6061)

0.13

0.33

Copper

0.53

0.14

Stainless steel (304)

0.91

3.68

Invar (36)

0.10

0.38

Silicon

0.02

0.03

Silicon carbide (30% Si)

0.02

0.03

Silicon carbide CVDi)

0.01

0.03

(a)Linear expansion coefficient/thermal conductivity.

(b)Linear expansion coefficient/thermal diffusivity.

© 2003 by CRC Press LLC

Section 5: Liquids

5.1Introduction

5.2Water

5.3Physical Properties of Selected Liquids

5.4Index of Refraction

5.5Nonlinear Optical Properties

5.6Magnetooptic Properties

5.7Commercial Optical Liquids

© 2003 by CRC Press LLC