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Spherical BiConvex Lenses
MATERIAL - ZnSe(Zinc Selenide)
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Crystaltechno Ltd. manufactures spherical biconvex lenses from fused silica, glass and different types of optical crystals, including ZnSe (Zinc Selenide) CVD.
Spherical biconvex lenses are widely used as focusing transfer optics.
These products are particularly for infrared applications including CO2 laser optics.
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PARAMETER |
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VALUE |
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Surface figure |
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Lambda/2 at 633 nm per inch |
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Scratch-Dig |
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80 - 50 |
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Diameter tolerance |
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± 0.1 mm |
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Paraxial Focal Length Tolerance |
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± 2% |
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Centration |
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less than 5 arc minutes |
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Clear aperture |
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>80 % |
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Bevels |
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(0.2-0.3) mm x 45° |
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D, mm |
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FL, mm |
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R1=R2, mm |
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tc, mm |
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te, mm |
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Part Number |
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12,7 |
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12,7 |
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34,61 |
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3,2 |
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2,0 |
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BCX17-01 |
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12,7 |
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19,0 |
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52,52 |
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2,8 |
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2,0 |
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BCX17-02 |
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12,7 |
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25,0 |
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69,24 |
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2,6 |
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2,0 |
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BCX17-03 |
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19,05 |
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19,0 |
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52,23 |
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3,8 |
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2,0 |
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BCX17-04 |
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19,05 |
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25,0 |
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69,02 |
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3,3 |
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2,0 |
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BCX17-05 |
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19,05 |
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50,0 |
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139,23 |
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2,7 |
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2,0 |
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BCX17-06 |
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19,05 |
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75,0 |
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209.29 |
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2.4 |
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2,0 |
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BCX17-07 |
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25,4 |
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25,0 |
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68.70 |
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4.4 |
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2,0 |
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BCX17-08 |
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25,4 |
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50,0 |
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139.07 |
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3,2 |
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2,0 |
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BCX17-09 |
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25,4 |
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75,0 |
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209.19 |
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2.8 |
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2,0 |
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BCX17-10 |
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25,4 |
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100,0 |
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279.26 |
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2.6 |
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2,0 |
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BCX17-11 |
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38,1 |
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50.0 |
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138.34 |
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5.6 |
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3,0 |
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BCX17-12 |
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38,1 |
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75.0 |
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208.61 |
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4.7 |
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3,0 |
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BCX17-13 |
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38,1 |
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100,0 |
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278.74 |
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4.3 |
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3,0 |
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BCX17-14 |
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38,1 |
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150,0 |
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418.88 |
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3.9 |
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3,0 |
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BCX17-15 |
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50,8 |
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50,0 |
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137.72 |
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7.7 |
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3,0 |
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BCX17-16 |
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50,8 |
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100,0 |
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278.44 |
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5.3 |
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3,0 |
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BCX17-17 |
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50,8 |
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150,0 |
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418.68 |
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4.5 |
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3,0 |
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BCX17-18 |
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50,8 |
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200,0 |
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558.79 |
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4.2 |
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3,0 |
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BCX17-19 |
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50,8 |
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250,0 |
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698.85 |
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3.9 |
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3,0 |
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BCX17-20 |
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* Numerical parameters correspond to Lambda=10.6 microns (n=2.4).
We produce two kinds of Zinc Selenide (ZnSe) CVD material, which differ in spectral transmittance and grain size, namely
- Zinc Selenide (ZnSe) CVD laser grade, grain size (50-70) microns, index of absorption 0.0005 cm-1 at 10.6 microns, optical component dimensions (3 – 100) mm, thickness 20mm, used in high power CO2 laser optics, in medical applications.
- Zinc Selenide (ZnSe) CVD IR optical grade, grain size (20-100) microns, index of absorption 0.003 cm-1 at 10.6 microns, optical component dimensions (3 - 300) mm, thickness 20mm, used in protective windows and thermal imaging equipment, in industrial applications.
You can see both spectral transmittance of laser grade and IR optical grade uncoated polished windows (thickness 2 mm).
Because of high refractive index (n=2.4 at 10.6 microns), Fresnel losses of ZnSe polished surface are equal 17% (at one side), thus the transmission of Zinc Selenide polished lens equals 68.9% at 10.6 micron. We offer two sides antireflection (AR/AR) coating both for one wavelength (10.6 microns or another) and for the spectral range (3 – 12) microns. Transmission of AR/AR coated Zinc Selenide (ZnSe) lens - up to 99%.
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