Harrick Scientific offers several hemispheres and hemicylinders for spectroscopic applications in Al₂O₃, Ge, Si and ZnSe. Our standard sizes are listed below. We welcome the opportunity to quote on other sizes and materials to meet your needs.
UV-Vis-IR Optical Materials for Hemispheres & Hemicylinders
| n | KH (psi) | MOR (psi) | useful range cm-1 (μm) | chemical properties | ||
|---|---|---|---|---|---|---|
| Windows 1-2mm | IRE 70mm | |||||
| Al2O3 | 1.76 | 1370 | 65,000† | 66,000-2000 (0.15-5.0) |
33,000-2800 (0.3-3.7) |
Slightly soluble in acids and bases |
| Ge | 4.0 | 550 | 7000 | 5000-600 (2.0-17) |
5000-900 (2.0-1.4) |
Insoluble in water, soluble in hot H2So4 agua regia |
| Si | 3.42 | 1150 | 9000 | 10,000-100 (1.0-100) |
9500-1500 350-FIR (1.06-6.7 30-FIR) |
Insoluble in most acids and bases; soluble in HF and HNO3 |
| ZnSe | 2.40 | 150 | 8000 | 20,000-500 (0.5-20) |
20,000-700 (0.5-14.3) |
Soluble in strong acids; dissolves in HNO3 |
| n: Refractive IndexKH: Knoop HardnessMOR: Rupture Modulus | ||||||