Zinc
Selenide Crystal
Zinc Selenide (ZnSe) optics are useful in a wide variety of applications,
from infrared radiation collection to laser cutting. The spectral
response of ZnSe makes it a particularly good substrate for CO2
laser optics. These optics offer high transmission in the visible
range to well past 10 microns, produce good results at 10.6μm
and are easily visually aligned. This is atypical of other substrates
designed for this region. Economically priced, plano-convex lenses
are ideal for use in laser cutting and welding, as well as other
applications where spot size and image quality are not as |
|
critical. Meniscus
lenses provide better overall performance than their PCX equivalent
by minimizing spherical aberration. This increased performance
can be found in lenses that have a f/# of F5 or lower. ZnSe is
a crystal material and not as strong as glass substrates, so great
care should be taken when handling, mounting and cleaning these
lenses. Apply uniform pressure when handling/mounting ZnSe lenses.
Tools, including tweezers, should not be used because the substrate
easily scratches, cracks, or chips. Latex finger cots and gloves
should always be worn when handling and cleaning these lenses
to keep from contaminating the substrate or coating. |
| Material |
ZnSe |
Refractive
Index
|
2.4028
@10.6μm |
Diameter
Tolerance
|
+0 /
-0.005" |
| Center
Thickness Tolerance |
±0.010" |
| Edge
Thickness Variation |
<0.002" |
| Clear
Aperture |
90% of
diameter |
| Focal
Length |
±2% |
| Surface
Quality |
20-10 |
Coating
|
AR coating |
|
Products>Waveplates Crystals>>ZnSe
Crystal
