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Crystal quartz is a positive uniaxial crystal. Optical grade crystal quartz features high transmittance from 200nm to 3500 nm, a high damage threshold, and excellent resistance to both scratching and chemical attacks. It exhibits a refractive index difference around 0.009 and it is widely used to make waveplates for polarization transformation.
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Figure 1: External transmittance curve for 7mm quartz crystal
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Transparency Range (nm) |
200~3500
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Crystal Symmetry Class |
Trigonal, D3(32)
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Lattice Constant (Å) |
a=4.9, c=5.4
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Crystal Class |
Positive Uniaxial
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Melting Temperature (K)
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1740 |
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Specific Heat (Cal/g·K) at 273K
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0.17 |
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Thermal Conductivity (W/m·K) at 300K
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||: 9.5 ⊥: 6.10 |
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Coefficient of Thermal Expansion (/K)
at 300K
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||: 7.74X10-6
⊥: 14.0X10-6 |
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Refractive Indices |
no=1.542737, ne=1.551809 at 630nm
no=1.527606, ne=1.53596 at 1550nm
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Laurent Series Equation (λ in um) |
no2=2.35728-0.0117·λ2+0.01054·λ-2+
1.34143·10-4·λ-4-4.45368·10-7·λ-6+5.92362·10-8·λ-8
ne2=2.3849-0.01259·λ2+0.01079·λ-2+
1.6518·10-4·λ-4-1.94741·10-6·λ-6+9.36476·10-8·λ-8
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Density (g/cm3) |
2.65 |
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Young's Modulus (GPa)
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||: 97.2
⊥: 76.5 |
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Shear Modulus (GPa)
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31.14 |
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Mohs Hardness |
7 |
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Table 1: Crystal Quartz Properties
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