Low-expansion quartz LEQZ ®
LEQZ ultra-low-expansion quartz glass reaches a diameter of 2 meters and has near-zero thermal expansion at room temperature with a controllable zero-expansion temperature region. This 2-meter material serves precision-system mirrors, laser resonator cavities, space telescopes, semiconductor-lithography optics, atomic clocks, and related applications.
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Overview
Specifications
| Parameter | Value |
|---|---|
| Mean Linear Expansion Coefficient α [LEQZ series physical properties (not separated by grade); 5~30℃] | 0 ± 30 ppb/℃ |
| Thermal Conductivity K [LEQZ series physical properties (not separated by grade); 22℃] | 1.31 ± 0.2 W/(m·K) |
| Thermal Diffusivity [LEQZ series physical properties (not separated by grade); 22℃] | 0.8 ± 0.05 mm²/s |
| Volume thermal resistivity [LEQZ series physical properties (not separated by grade); 200℃; Original field name/negative exponent retained as in the source] | （5-7）×10⁻¹² |
| Mean specific heat Cp [LEQZ series physical properties (not separated by grade)] | 760 ± 40 J/(kg·℃) |
| Strain Point [LEQZ series physical properties (not separated by grade)] | 890 ℃ |
| Annealing point [LEQZ series physical properties (not separated by grade)] | 1000 ℃ |
| Softening Point [LEQZ series physical properties (not separated by grade)] | 1300 ℃ |
| Poisson’s Ratio ν [LEQZ series physical properties (not separated by grade)] | 0.15 ± 0.03 |
| Knoop Hardness [LEQZ series physical properties (not separated by grade); 100g, 20s] | 518 ± 10% |
| Density ρ [LEQZ series physical properties (not separated by grade)] | 2.21 ± 10% |
| Specific stiffness E/ρ [LEQZ series physical properties (not separated by grade)] | 3.0 ± 0.2 × 10⁶ |
| Shear Modulus G [LEQZ series physical properties (not separated by grade)] | 29 ± 5 GPa |
| Bulk Modulus K [LEQZ series physical properties (not separated by grade)] | 34.1 ± 5 GPa |
| Elastic Modulus [LEQZ series physical properties (not separated by grade)] | 67.6 ± 10 GPa |
| Refractive Index [LEQZ series physical properties (not separated by grade); Material with nominal CTE; 632.8nm] | 1.482 ± 0.003 |
| Abbe Number V_d [LEQZ series physical properties (not separated by grade)] | 52.1 ± 1 |
| Stress birefringence [LEQZ-1; 95% confidence interval; Source unit mm/cm] | 10 mm/cm |
| Radial uniformity [LEQZ-1; 95% confidence interval] | 10 ppb/℃ |
| Striae level [LEQZ-1] | 100% |
| Zero-crossing temperature [LEQZ-1] | 5-35℃ ± 5℃ |
| Mean linear CTE [LEQZ-1] | ± 30 ppb |
| Stress birefringence [LEQZ-2; 95% confidence interval; Source unit mm/cm] | 20 mm/cm |
| Radial uniformity [LEQZ-2; 95% confidence interval] | 15 ppb/℃ |
| Striae level [LEQZ-2] | 100% |
| Zero-crossing temperature [LEQZ-2] | 5-35℃ ± 10℃ |
| Mean linear CTE [LEQZ-2] | ± 30 ppb |
| Stress birefringence [LEQZ-3; 95% confidence interval; Source unit mm/cm] | 20 mm/cm |
| Radial uniformity [LEQZ-3; 95% confidence interval] | 15 ppb/℃ |
| Striae level [LEQZ-3] | 100% |
| Zero-crossing temperature [LEQZ-3] | 5-35℃ ± 10℃ |
| Mean linear CTE [LEQZ-3] | ± 30 ppb |
| Stress birefringence [LEQZ-4; 95% confidence interval; Source unit mm/cm] | 30 mm/cm |
| Radial uniformity [LEQZ-4; 95% confidence interval] | 30 ppb/℃ |
| Striae level [LEQZ-4] | 200% |
| Zero-crossing temperature [LEQZ-4] | 5-35℃ ± 10℃ |
| Mean linear CTE [LEQZ-4] | ± 30 ppb |
| Stress birefringence [LEQZ-5; 95% confidence interval; Source unit mm/cm] | NS |
| Radial uniformity [LEQZ-5; 95% confidence interval] | 100 ppb/℃ |
| Striae level [LEQZ-5] | NS |
| Zero-crossing temperature [LEQZ-5; NS=No special requirements] | NS |
| Mean linear CTE [LEQZ-5] | ± 100 ppb |
| Size Range [LEQZ-1] | Φ ≤ 500 |
| Maximum inclusion diameter [LEQZ-1] | 1 mm |
| Number of inclusions [LEQZ-1] | ≤24 items/100 cm³ |
| Mean number of inclusions [LEQZ-1] | ≤0.61 items/100 cm³ |
| Size Range [LEQZ-2] | Φ ≤ 500 |
| Maximum inclusion diameter [LEQZ-2; Critical layer (surface 5mm)] | 1 mm |
| Number of inclusions [LEQZ-2; Critical layer (surface 5mm)] | ≤24 items/100 cm³ |
| Mean number of inclusions [LEQZ-2; Critical layer (surface 5mm)] | ≤0.61 items/100 cm³ |
| Maximum inclusion diameter [LEQZ-2; Noncritical layer] | 2.5 mm |
| Mean number of inclusions [LEQZ-2; Noncritical layer] | ≤1.2 items/100 cm³ |
| Size Range [LEQZ-3] | 500 < Φ ≤ 1500 |
| Maximum inclusion diameter [LEQZ-3; Critical layer (surface 5mm)] | 2 mm |
| Number of inclusions [LEQZ-3; Critical layer (surface 5mm)] | ≤37 items/100 cm³ |
| Mean number of inclusions [LEQZ-3; Critical layer (surface 5mm)] | ≤1.2 items/100 cm³ |
| Maximum inclusion diameter [LEQZ-3; Noncritical layer] | 6.4 mm |
| Mean number of inclusions [LEQZ-3; Noncritical layer] | ≤3.7 items/100 cm³ |
| Size Range [LEQZ-4] | Φ ≤ 500 |
| Bubbles and inclusions [LEQZ-4; Two groups in the same cell have no labeled conditions and await clarification] | Maximum inclusion diameter: 2.5 mm | Average quantity/100 cm³: ≤ 1.2 inclusions; Maximum inclusion diameter: 6.4 mm | Average quantity/100 cm³: ≤ 3.7 inclusions |
| Size Range [LEQZ-5] | Φ ≤ 1500 |
| Bubbles and inclusions [LEQZ-5] | No Requirement |
| CTE uniformity [Sample OD1100×125mm] | 17.1 ppb/℃ |
| CTE uniformity [Sample 153×153×7mm] | 5.1 ppb/℃ |
| Zero-crossing temperature [Short overview attribute; Not separated by model] | 20 ℃ |
Applications
Key Features
Datasheet
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