Fused Silica Optics Co.,LTD
Fused Silica Optics Co.,Ltd
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Optical Grade Zinc Selenide(ZnSe) AR Coated Windows for Ftir
Chemically vapor-deposited Zinc Selenide (CVD ZnSe) is a preferred material for optical components in high power CO2 lasers due to its low absorption at 10.6μm. Also, for its excellent optical performance, CVD ZnSe is widely used as mirror, lenses and prisms in high resolution FLIR systems.
CVD ZnSe shows theoretical transmission across 0.5~18μm waveband and has very low absorption at 10.6μm with the bulk absorption coefficient less than 5×10-4cm-1. Fine controlled grain size makes Fused Silica Optics's CVD ZnSe stable to thermal shock and hostile environment.
Blanks, windows, lenses and prisms can be made according to your specifications, with the size up to 250×200×12mm.
Specifications:
| Materials | ZnS( Zinc Sulfide) |
| Shapes | Circular: windows, spherical lenses,Rectangular: windows, Special: domes, prisms |
| Maximum Dimension | Circular: 250×12mm Rectangular: 250×200×12mm Dome:300mm |
| Tolerance | Diameter: +/- 0.05mm |
| Length & Width: +/-0.05mm | |
| Thickness: +/- 0.05mm | |
| Caliber:+/- 0.05mm | |
| Surface Quality | Plano blanks: as cut |
| Polished windows/domes: to customer | |
| Clear Aperture | >90% |
| Surface Flatness | 1/2 lambda, 1/4lambda or better |
| Parallelism | ‘+/-3' , +/-30'' or better |
| Bevel | <0.2mm±45° |
| Coating | Uncoated, AR, BBAR, Reflective |
| Symbol | ZnS |
| Crystal Structure | Cubic |
| Melting Point (℃) | 1830 |
| Density (g/cm3) | 4.09 |
| Purity | > 99.9995% |
| Band Gap | 3.66eV(@300K) |
| FLIR Grade | Water-clear Grade | |||||
| Wavelength(μm) | n | Wavelength(μm) | n | |||
| 0.5 | 2.419 | 0.5086 | 2.41279 | |||
| 0.7 | 2.332 | 0.7065 | 2.33073 | |||
| 1 | 2.292 | 1.014 | 2.29165 | |||
| 3 | 2.257 | 3 | 2.25772 | |||
| 5 | 2.246 | 5 | 2.24661 | |||
| 7 | 2.232 | 8 | 2.22334 | |||
| 8.2 | 2.221 | 10 | 2.20084 | |||
| 10.2 | 2.198 | 11.25 | 2.18317 | |||
| 11 | 2.186 | |||||
| Bulk Absorption Coefficient (@10.6μm, cm-1) | ≤ 0.2 | ≤ 0.2 | ||||
| Index of Refraction Homogeneity (@0.6328μm) | < 5×10-5 | < 5×10-5 | ||||
| Thermo-optic Coefficient (dn/dt) | 6.4×10-5(@0.63μm) | 5.4×10-5(@0.63μm) | ||||
| 4.2×10-5(@1.15μm) | 5.0×10-5(@1.15μm) | |||||
| 4.6×10-5(@3.39μm) | 4.6×10-5(@3.39μm) | |||||
| 6.6×10-5(@10.6μm) | 4.6×10-5(@10.6μm) | |||||
| FLIR Grade | Water-clear Grade | |||||
| Thermal Expansion Coefficient (10-6, ℃-1) | 7.85 | 7.85 | ||||
| Modulus of Rupture (Mpa) | 103.4(@room temperature) | 68(@room temperature) | ||||
| 160(@660℃) | 160(@600℃) | |||||
| Thermal Conductivity (@300K,Wcm-1.K-1) | 0.19 | 0.272 | ||||
| Heat Capacity(Cal/g.K) | 0.112 | 0.124 | ||||
| Youngs Modulus (Gpa) | 74.5 | 74.5 | ||||
| Poisson's Ratio | 0.29 | 0.28 | ||||
| Hardness(knoop)(kg/mm2) | 200-230 | 160 | ||||