Product DescriptionGermanium lenses/Ge lensesGermanium lenses are
optical lenses made of polished germanium. These lenses are rugged
and resistant to corrosion, and are ideal for harsh environments
and applications where there is constant exposure to the elements.
Our germanium lenses have a high refractive index-the highest
refractive index among readily available IR transmitters. It also
exhibits minimal chromatic aberration due to low dispersion.
Because of these properties, Ge lenses are ideal for use in
infrared (FLIR and FTIR) field applications. Other applications
include thermal imaging systems and precision analytic instruments
which may be used in harsh environments. Germanium is also subject
to thermal runaway. What this means is that the transmission will
decrease as temperature increases, and the lens becomes opaque.
Because of this thermal runaway effect, germanium lenses should
only be used at temperatures below 100°C. Germanium has optimal
transmission (over 45%) in the 2-12 μm band, which makes it most
useful for mid-infrared light. With anti-reflective coatings,
transmission can be brought up to about 95%. The types of Germanium
Lenses include plano-concave, p-convex, concave-convex and aspheric
germanium lenses. Substrate Material Ge (Germanium) Diameter
5mm-350mm Shape Spherical Plano-Concave, Plano-Convex,
Concave-Convex or Aspheric Focal length +/-1% Surface Quality 20-10
(after coating) Surface figure l/4 @ 633nm Clear Aperture >85%
of central dimension Antireflection Coating @ 3-12 um Ebetter
Optics manufactures quality germanium lenses in a range of popular
sizes, from 5m m to 350 mm in diameter. Our standard anti
reflective coating is best suited for light transmissions between 3
and 12 μm. The focal length of our lenses is determined up to a
+/-1% tolerance, and the surface flatness is l/4 @ 633nm.
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