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 Products>Waveplates Crystals>>Quartz
Crystal |
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Quartz
Crystal Optically, crystalline quartz is used extensively as a wave retardation medium, using the birefringent properties for use in quarter-wave plates and in polarizers. Quartz is mined naturally, but more commonly produced synthetically in large long faceted crystals. Quartz is positive birefringent. Be careful not to confuse terminology in this material, as "fused quartz" is often used to denote the glassy non-crystalline form better known as silica. Optical Quality Cultured Crystalline Quartz is available in three grades defined by optical absorption at two wavelength: 190 nm and 2800 nm (a - coefficient of absorption, 1/cm). |
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| Crystal Quartz | |
 |
 |
|
Quality
Grade |
a max @ 190 nm |
a max
@ 2800 nm |
|
1 |
0.010 |
0.030 |
|
2 |
0.025 |
0.045 |
|
3 |
0.050 |
0.070 |
| BASE PROPERTIES |
|
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 |
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Transmission Range |
0.4 - 4.5 μm |
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Debye Temperature |
470 K |
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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) |
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Thermal Expansion |
|
|
parallel |
97.2 GPa |
|
perpendicular |
76.5 GPa |
|
Bulk Modulus |
36.4 GPa |
|
Shear Modulus |
31.14 GPa |
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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 |
|
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