Zinc Sulfide Aspherical Lens

Zinc sulfide aspherical lenses have high transmittance in the infrared band, as well as good mechanical properties and chemical stability. Compared to traditional spherical lenses, zinc sulfide non spherical lenses can better control the direction of light propagation and focusing effect. It has high transmittance and good optical performance, and is used to manufacture high-precision optical systems and instruments, such as lasers, telescopes, microscopes, etc. Can be coated with MgF2, UV-AR, UV-VIS, VIS-EXT, VIS-NIR, NIR I, NIR II, Telecom NIR, SWIR, SWIR, YAG-BBAR and other film systems.

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	Dia(mm)	Focal Length(mm)	Center Thickness(mm)	Edge Thickness(mm)	Design Wavelength(μm)	Radius of Curvature(mm)	Surface Quality
	Screen Reset 2-300	Screen Reset 15-5000	Screen Reset 0.12-60	Screen Reset 0.12-60	Screen Reset Custom	Screen Reset Custom	Screen Reset 60-40
More+ Less	2-300	15-5000	0.12-60	0.12-60	Custom	Custom	60-40
Zinc Sulfide Aspherical Lens Number：PAsZS- Dia(mm)：2-300 Focal Length(mm)：15-5000 Center Thickness(mm)：0.12-60 Edge Thickness(mm)：0.12-60 Design Wavelength(μm)：Custom Radius of Curvature(mm)：Custom Surface Quality：60-40 Diameter Tolerance(mm)：+0.0/-0.1 Thk Tolerance(mm)：±0.1 Substrate Material：Zinc Sulfide（ZnS） PV@632.8nm：λ/4 Centering：<3′ Clear Aperture：>90% Coating：Uncoated REACH：Compliant ROHS：Compliant

Material Data
Physical Properties	CVD ZnS	Multispectral CVD ZnS
Density [g/cm3]	4.09	4.09
Resistivity [Ω.cm]	~1012	~101.3
Melting Point [℃]	1827
Chemical Purity [%]	99.9996	99.9996
Thermal Expansion [1/K]	6.610-6@273k 7.310-6@373k	6.310-6@273k 7.010-6@373k
Thermal Conductivity [J/k.m.s]	16.7@298k	27.2@298k
Specific Heat Capacity [J/g.K]	0.469@298k	0.515@298k
Knoop Hardness [kg/mm2]	200-235	160
Bending Strength [Mpa]	103
Young's Modulus [GPa]	74.5	74.5
Poisson's Coefficient	0.29	0.29
Optical Properties
Transmission Range	1-14μm	0.37-14μm
Refractive index inhomogeneity [△n/n]	<7.3*10-4@10.6μm	<0.2*10-4@632.8nm
Absorption Coefficient [1/cm]	0.2@10.6μm	0.2@10.6μm
Thermal light coefficient [1/k,298-358k]	4.610-5@1150nm 4.310-5@3390nm 4.1*10-5@10.6μm	5.4310-5@632.8nm 4.2110-5@1150nm 3.87*10-5@3390nm

CVD ZnS
Wavelength(nm)	Refractive Index(n)	Wavelength(nm)	Refractive Index(n)
620	2.355	9800	2.203
1000	2.292	10600	2.192
3800	2.253	11400	2.18
5000	2.246	12200	2.167
7000	2.232	13800	2.132
9000	2.212	14200	2.126

Multispectral CVD ZnS
Wavelength(nm)	Refractive Index(n)	Wavelength(nm)	Refractive Index(n)
400	2.545	8000	2.223
1010	2.292	9000	2.213
2060	2.264	10000	2.201
3500	2.255	11250	2.183
4500	2.25	12000	2.171
5000	2.247	13000	2.153