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  • ZnSe Focusing Lenses for CO2 Lasers
  • ZnSe Focusing Lenses for CO2 Lasers

ZnSe Focusing Lenses for CO2 Lasers


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Specifications:

Materials CVD ZnSe crystals Size Tolerance +0.0/-0.1mm
Central Thickness Tolerance +/-0.1mm Surface Quality 40/20 S/D
Frings (N) <3 Irregularity(delta N) <1
Centration <3’ Tolerance of Focal Length +/-1%
Aperture >90% Chamfer 0.1-0.3mmx45degree
Coating AR/AR@10.6μm (T>99.5%@10.6μm)
  

Basic Properties:

Transmission Range 0.6 to 21.0μm Refractive Index 2.4028 at 10.6μm
Reflection Loss 29.1% at 10.6μm (2 surfaces) Absorption Coefficient 0.0005 cm-1 at 10.6μm
Reststrahlen Peak 45.7μm dn/dT +61 x 10-6 /°C at 10.6μm at 298K
dn/dμ = 0 5.5μm Density 5.27 g/cc
Melting Point 1525°C (see notes below) Thermal Conductivity 18 W m-1 K-1 at 298K
Thermal Expansion 7.1 x 10-6 /°C at 273K Hardness Knoop 120 with 50g indenter
Specific Heat Capacity 339 J Kg-1 K-1 Dielectric Constant n/a
Youngs Modulus (E) 67.2 GPa Shear Modulus (G) n/a
Bulk Modulus (K) 40 GPa Elastic Coefficients Not Available
Apparent Elastic Limit 55.1 MPa (8000 psi) Apparent Elastic Limit 55.1 MPa (8000 psi)
Poisson Ratio 0.28 Solubility 0.001g/100g water
Molecular Weight 144.33 Class/Structure HIP polycrystalline cubic, ZnS, F43m
 

Modules or Types:

Following modules and types of the CO2 laser ZnSe focusing lenses are available in stock:

Diameter (mm) Edge-thickness (mm) Materials Lens Types (Optional) Focal Length (mm) (optional) Wavelength (μm)
12 2 CVD ZnSe Plano-Convex or Meniscus 25.4/38.1/41/50.8/63.5/100 10.6
18 2 CVD ZnSe Plano-Convex or Meniscus 25.4/38.1/41/50.8/63.5/100 10.6
19 2 CVD ZnSe Plano-Convex or Meniscus 25.4/38.1/41/50.8/63.5/100 10.6
20 2 CVD ZnSe Plano-Convex or Meniscus 25.4/38.1/41/50.8/63.5/100 10.6
25 2 CVD ZnSe Plano-Convex or Meniscus 25.4/38.1/41/50.8/63.5/100 10.6
25.4 2 CVD ZnSe Plano-Convex or Meniscus 25.4/38.1/41/50.8/63.5/100 10.6
30 2 CVD ZnSe Plano-Convex or Meniscus 25.4/38.1/41/50.8/63.5/100 10.6
38.1 2 CVD ZnSe Plano-Convex or Meniscus 25.4/38.1/41/50.8/63.5/100 10.6

Focusing lenses is indispensable part of the CO2 laser systems for laser processing (cutting, punching, welding, graving, etc) and other kind of applications, ZnSe are often used to make the CO2 laser focusing lenses. Two series of CO2 laser lenses: Plano-convex series lenses and meniscus series lenses are developed and available in our stock for your choice.

AR coating is always critical for the laser optics, our coating is high damaging threshold, durable and wiping-resistant, with a high transmittance of T≥99.5%@10.6mm for AR/AR coating. Our meniscus series lenses are optimal design in diffraction and aberration, which makes the laser beam has a minimum beam-spot diameter. Hangzhou Shalom EO also offer the optimal design service for your meniscus lenses.