Quartz Crystal
Optically, crystalline quartz is used extensively as a wave retardationmedium, using the birefringent properties for use in quarter-wave platesand in polarizers. Quartz is mined naturally, but more commonly producedsynthetically in large long faceted crystals.
Quartz is positive birefringent.
|
PARAMETER
|
VALUE
|
|
Crystal Class
|
Hexagonal
|
|
Molecular Weight
|
60.06
|
|
Density
|
2.635-2.660 g/cm3 at 289 K
|
|
Dielectric Constant
|
|
|
for 3x107 Hz at 295 K
parallel perpendicular |
35 microns
4.27 4.34 |
|
Reflection Loss
|
8.2 % for two surfaces at 2 mm
|
|
Melting Temperature
|
1740 K
|
|
Specific Heat
|
0.17 cal/(g K) at 273 K
|
|
Knoop Hardness
|
741 kg/mm2
|
|
Transmission Range
|
0.4 - 4.5 μm
|
|
Debye Temperature
|
470 K
|
|
Thermal Conductivity
|
|
|
at 20 K (parallel/perpendicular)
|
720/370 W/(m K)
|
|
at 194 K (parallel/perpendicular)
|
20/10W/(m K)
|
|
at 323 K (parallel/perpendicular)
|
10.7/6.2W/(m K)
|
|
Thermal Expansion
|
|
|
parallel
|
97.2 GPa
|
|
perpendicular
|
76.5 GPa
|
|
Bulk Modulus
|
36.4 GPa
|
|
Shear Modulus
|
31.14 GPa
|
|
Solubility in water
|
None
|
|
Bangap
|
8.4
|
REFRACTIVE INDEX:
|
Wavelength, μm
|
no
|
ne
|
|
0.1850
|
1.65751
|
1.68988
|
|
0.1980
|
1.65087
|
1.66394
|
|
0.2310
|
1.61395
|
1.62555
|
|
0.3400
|
1.56747
|
1.57737
|
|
0.3940
|
1.55846
|
1.56805
|
|
0.4340
|
1.55396
|
1.56339
|
|
0.5080
|
1.54822
|
1.55746
|
|
0.5893
|
1.54424
|
1.55335
|
|
0.7680
|
1.53903
|
1.54794
|
|
0.8325
|
1.53773
|
1.54661
|
|
0.9914
|
1.53514
|
1.54392
|
|
1.1592
|
1.53283
|
1.54152
|
|
1.3070
|
1.53090
|
1.53951
|
|
1.3958
|
1.52977
|
1.53832
|
|
1.4792
|
1.52865
|
1.53716
|
|
1.5414
|
1.52781
|
1.53630
|
|
1.6815
|
1.52583
|
1.53422
|
|
1.7614
|
1.52468
|
1.53301
|
|
1.9457
|
1.52184
|
1.53004
|
|
2.0531
|
1.52005
|
1.52823
|
|
2.3000
|
1.51561
|
|
|
2.6000
|
1.50986
|
|
|
3.0000
|
1.49953
|
|
|
3.5000
|
1.48451
|
|
|
4.0000
|
1.46617
|
|
|
4.2000
|
1.45690
|
|
|
5.0000
|
1.41700
|
|
|
6.4500
|
1.27400
|
|
|
7.0000
|
1.16700
|
Capabilities:
|
Item
|
Quartz Crystal
|
Transmission of Quartz Crystal
|
|
Wavelength
|
150-4000nm
|
 |
|
Size
|
0.1-100mm
|
|
|
Orientation
|
<6 arc min
|
|
|
Parallelism
|
<1arc sec
|
|
|
Surface Quality
|
10/5
|
|
|
Flatness
|
λ/ 10
|
|
|
Clear Aperture
|
>95%
|
|
|
Coating
|
Upon Customer's Specification
|
|