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). 


                    

SPECIFICATIONS
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
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 

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