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Zinc Selenide (Refractive index:2.4028 @10.6m) 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 10.6m 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.
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