Zinc Selenide (ZnSe)Plano-Convex Lenses
Zinc selenide (ZnSe)material has a high tolerance to thermal shock, making it to to be an optical material for high power CO2 laser systems. The hardness is only 2/3 of multispectral grade ZnS, the material is soft and prone to scratching, and the material has a large refractive index, so it needs to be coated with a high hardness anti-reflective film to protect it and obtain a high transmittance. In common spectral range, the scattering is very low.
Zinc Selenide (ZnSe)Plano-Convex Lenses is convex on one side and flat on the other and has a positive focal length, and is often widely in various optical systems and equipment, such as lasers, optical instruments, spectral analysis instruments, etc.
Nova can provide Zinc Selenide (ZnSe)Plano-Convex Lenses with diameters from 2-300mm.and thicknesses from 0.12-60mm (accuracy up to 20-10, 1/10L@633nm),coating AR, BBAR, AF or upon request.
Technical parameters of Znse Plano-Convex Lens
Diameter | 2-300mm |
Focal length | 15-5000mm |
Thicknesses | 0.12-60mm |
Dimension tolerance | +0/-0.1mm |
Thickness tolerance | ±0.1mm |
Surface quality (scratch & dig) | 60-40, 40-20, or better |
Surface accuracy | λ/2, λ/4 or better |
Parallelism | 3' ,30'' |
Bevel | 0.1~0.3mm x 45 degree |
Clear aperture | >85%,>90% |
Coating | AR coating or cutom |
Material properties of ZnSe
| Physical Properties | |
| Crystal Structure | Cubic |
| Density[g/cm3] | 5.27 |
| Resistivity[Ω.cm] | ～1012 |
| Melting Point [℃] | 1525 |
| Chemical purity[%] | 99.9996 |
| Thermal Expansion [1/K] | 7.1*10-6@273k |
| 7.8*10-6@373k | |
| 8.3*10-8@473k | |
| ThermalConductivity [J/k.m.s] | 18.0@298k |
| Specific Heat Capacity [J/g.K] | 0.339@298k |
| Knoop Hardness [kg/mm2] | 110 |
| Bending strength [Mpa] | 55 |
| Young's Modulus [GPa] | 67.2 |
| Poisson's coefficient | 0.28 |
| Optical Properties | |
| Transmission Range | 0.5-22μm |
| Refractive index inhomogeneity[△n/n] | <3*10-6@632.8μm |
| Absorption coefficient [1/cm] | 5.0*10-3@1300nm |
| 7.0*10-4@2700nm | |
| 4.0*10-4@3800nm | |
| 4.0*10-4@5250nm | |
| 5.0*10-4@10600nm | |
| Thermal light coefficient[1/k,298-358k] | 1.07*10-4@632.80nm |
| 7.0*10-5@1150nm | |
| 6.2*10-5@3390nm | |
| 6.1*10-5@10600μm | |
Transmission curve
Zinc selenide has high transmittance in the 600nm-16um and is commonly used in thermal imaging, infrared imaging, and medical systems. Also, due to its low absorption, zinc selenide is particularly suitable for use in high-power CO2 lasers. It should be noted that zinc selenide is a relatively soft material (Nucleus hardness 120) and is easily scratched, so it is not recommended for use in harsh environments.
