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Quartz Crystal
Quartz is a slightly birefringent crystal, which make Quartz an important material for making optical waveplate. Large size, high quality optical grade Quartz is synthesized in an autoclave via the hydrothermal process. Quartz crystal is relatively abundant in nature, however high quality optical grade quartz are mostly synthetic. Single synthetic crystal quartz is grown by hydrothermal method in autoclaves. The autoclave works on the principle of hydrothermal gradients with temperatures in 350 - 450 °C and pressures exceeding 1,000 atmospheres.
In electronics, quartz crystals are used for accurate timing and frequency control, such as cell phone, satellite communications, radio transmitters, gas pumps meter, etc.
Quartz Physical and Optical Properties
Refractive Index : no = 1.5350, ne = 1.5438 @ 1 µm
Density : 2.65 g/cm³
Melting Point : 1710°C, 1657°C
Thermal Conductivity : //C: 11.7 W/(m·K) @ 20°C; ⊥C: 6.5
Specific Heat : 744 J/(kg·K)
Thermal Expansion : //C: 7.97 x 10E-6 /°C ; ⊥C: 13.37 x 10-6 /°C @ 0°-80°C
Hardness (Mohs) : 740 (Indenter load 500g)
Young`s Modulus : //C: 97; ⊥C: 76.5 GPa @ 25°C
Shear Modulus : 44 GPa
Bulk Modulus : 98 GPa
Rupture Modulus : 41 MPa
Elastic Coefficient : C11 = 86.6; C12 = 6.7; C13 = 12.4; C14 = 17.8; C33= 106.4; C44 = 58 GPa
Dielectric Constant : //C: 4.27 @ 30 MHz @ 25°C; ⊥C: 4.34
Solubility in Water : insoluble
Crystal Structure : trigonal, point group 32, a = 4.9138 Å, c = 5.4052 Å
Quartz Specifications:
| Size: | Z: max 135 mm, X: 150 mm, Y: 240-280 mm |
| Inclusion | IEC grade I |
| Q-value: | >2.40 million. |
| Homogeneity: | 1x10E-5 |
| Dimension tolerance | +/-0.1mm |
| Oriential tolerance | 6 arc minutes |
| Surface Quality | 10/5 |
| Flatness | λ/10 @ 632.8nm |
| Parallelism | 10 arc seconds |
| Perpendicularity | 5 arc minutes |
Refractive indexs of cultured quartz:
| Wavelength(nm) | No | Ne |
| 193.6 | 1.659990 | 1.673430 |
| 340.4 | 1.567470 | 1.577385 |
| 410.2 | 1.556502 | 1.566031 |
| 467.8 | 1.551027 | 1.560368 |
| 546.1 | 1.546174 | 1.555350 |
| 627.8 | 1.542819 | 1.551880 |
| 706.5 | 1.540488 | 1.549472 |
| 766.5 | 1.539071 | 1.548005 |
| 844.7 | 1.537525 | 1.546400 |
| 1529.6 | 1.528000 | 1.536460 |
| 2058.2 | 1.519980 | 1.528140 |
Quartz Application:
- Piezoelectric Component
- VUV Filter
- FIR Window
- Prism
- Rotator
- Waveplate
Note: Quartz should not be processed or used at temperatures greater than 490 °C. At temperatures >490°C, Crystal Quartz starts to revert to glassy state, a process which is complete by 530°C. At this time, as annealling is unlikely, fracture of component is probable.
It should be specially emphasized that peculiarities together with excellent DUV transmission make crystal quartz the unique material for production of optical components for various instruments, equipment and complex integrated systems operating in UV spectral range. Quartz crystal's good optical transmission over 100 μm wavelengths allows it to be effectively utilized as THz diapason as well.
Quartz crystal order information
OptoCity offer as cut Quartz plate as well as precisely polished Quartz crystal products. Please fill the following form to request for quote.