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Lenses

Ealing produce lenses in a wide range of forms, materials and sizes.

For visible wavelengths and infrared up to 2.5 microns, BK-7 glass is preferred.  

In the UV below 350 nm, fused silica or Calcium Fluoride is the best solution.

Applications where there are excessive thermal conditions may require the use of sapphire lenses.

Germanium and Zince Selenide are best suited to the Infrared above 2 microns.

Here is a description of the different lens materials:


Fused Silica Laser Lenses

Ealing’s line of  LaserLenses™ are ideal for most laser applications. They are made of UV grade fused silica which can withstand the thermal heating from a laser beam much better than glass.  LaserLenses have excellent transmission down into the UV spectrum and have been precision polished to minimise scatter and wavefront distortion. For optimal transmission, a standard UV AR coating is available.  

Glass Lenses

Optical glass is predominantly used from 350nm – 2500nm – in fact within this spectral region there is usually no need to consider any other material.   

A range of lenses are available including:

  • Plano-convex
  • Plano-concave
  • Bi-convex
  • Bi-concave

Aspheric Lenses

Aspheric lenses have at least one surface that is not a true sphere. The aspheric profile used is frequently a conic surface of revolution about the lens axis, matched in design to the shape of the second surface.  The shape of this lens produces a dramatic reduction of the spherical aberration, even for very low F-numbers.

Calcium Fluoride Lenses

These lenses are available in plano-convex and plano-concave forms. Calcium fluoride exhibits excellent transmission from 150nm in the ultraviolet through to 7 microns in the infrared.   Because of the low refractive index of calcium fluoride, in most cases an antireflection coating is not required.

A range of lenses can be found on the Ealing website here.

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Lenses