Crystalline Quartz ( SiO2 )

Transmission Range

0.18 ... 3.6 µm

Refractive Index

n_o= 1.6775, n_e= 1.6899 @ 185 nm
n_o= 1.5709, n_e= 1.5809 @ 325 nm
n_o= 1.5482, n_e= 1.5575 @ 508 nm
n_o= 1.5423, n_e= 1.5513 @ 644 nm
n_o= 1.5201, n_e= 1.5282 @ 2.05 µm
n_o= 1.4995, n_e= 1.5070 @ 3.00 µm

dn / dT

–6.5 ×10^–7 / K || Y, –5.5 ×10^–7 / K _|_ Y

Density

2.648 g/cm³

Melting Point

1700 °C

Molecular Weight

60.08

Thermal Conductivity

1.4 W/(m K)

Specific Heat

787 J/(kg K) @ 25 °C

Thermal Expansion

5 ×10^–7

Hardness (Knoop)

461 @ 200 g, 741 @ 500 g indenter load

Young's Modulus

76.5 GPa _|_ Y , 97.2 GPa || Y

Shear Modulus

36.4 GPa / 57,13 GPa

Bulk Modulus

98.98 GPa

Elastic Coefficient

C₁₁ = 86.75 / C₁₂ = 6.87 / C₁₃ = 11.3 /
C₃₃ = 106.8 / C₄₄ = 57.86 GPa

Dielectric Constant

3.9 / 4.34

Solubility in Water

insoluble

Crystal Structure

single crystal

Cleavage Planes

none

Orientation-plan Quartz

AT cut = + 35^o
from Z towards Y

BT cut = - 49^o
from Z towards Y

CT cut = + 38^o
from Z towards Y

DT cut = - 52^o
from Z towards Y

ET cut = - 66^o
from Z towards Y

FT cut = - 57^o
from Z towards Y

List of Optical Crystals

Materials

Refractive Index

Transmission
Range (mm)

Density
(g/cm³)

Thermal Expansion 
Coefficient (10^-6/K) 

BK7 glass

1.5164 (588 nm)

0.330 – 2.1

2.51

7.5 

SF11 glass

1.78472 (588 nm)

0.370 – 2.5

4.74

6.8 

F2 glass

1.62004 (588 nm)

0.420 – 2.0

3.61

8.2 

Fused Silica

1.4858 (308 nm)

0.185 – 2.5

2.20

0.55 

CaF₂

1.399  (5.0 mm)

 0.170 – 7.8

3.18

 18.85 

BaF₂

 1.460 (3.0 um)

 0.15 – 12.0

4.88

 18.4 

Sapphire

1.755 (1.0mm)

0.180 – 4.5

3.98

8.4 

Silicon

3.4179 (10mm)

 1.200 – 7.0

2.33

 4.15 

Ge

4.003 (10 mm)

 1.900 – 16

5.33

 6.1 

ZnSe

2.40  (10 mm)

0.630 – 18

5.27

7.8 

ZnS

2.2 (10mm)

0.380 –14

4.09

6.5 

LiF

1.39 (500 nm)

 0.150 – 5.2

2.64

37 

KBr

1.526 (10 mm)

 0.280 – 22

2.75

43 

MgF₂

n_o =  1.3836
n_e = 1.3957 (405 nm)

0.130 – 7.0

7.37

a: 13.7
b: 8.48 

YVO₄

n_o = 1.9500
n_e = 2.1554 (1.3 mm)

0.400 – 5.0

4.22

a: 4.46
b: 11.37 

Calcite

n_o =  1.6557
n_e = 1.4852 (633 nm)

0.210 – 2.3

2.75

a: 24.39
b: 5.68 

Quartz

n_o =  1.5427
n_e = 1.5518 (633 nm)

0.200 – 2.3

2.65

7.07 

α-BBO

n_o =  1.6749
n_e = 1.5555 (532 nm)

0.190 – 3.5

3.85

a: 4.0
c: 36 

LiNbO₃

n_o =  2.2863
n_e = 2.2027 (633 nm)

0.370 – 4.5

4.64

a: 16.7
c: 2.0