An Achromatic Lens or Achromat is a Lens that is designed to limit the effects of chromatic and spherical aberration. Achromatic Lenses are corrected to bring two wavelengths (typically red and blue) into focus in the same plane

 

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The most common type of Achromat is the Achromatic doublet, which is composed of two individual lenses made from glasses with different amounts of dispersion. Typically, one element is a negative (concave) element made out of flint glass such as F2, which has relatively high dispersion, and the other is a positive (convex) element made of crown glass such as BK7, which has lower dispersion.

They deliver high performance when the application involves small fields of view, typically up to 6 degrees. Their image quality surpasses that of singlets

Typical applications where achromatic doublet lenses are used are imaging, analyzers, fiber-optic lighting, laser range finders endoscopes and borescopes.

All standard achromatic lenses that Optica manufactures are supplied with MgF2 single layer anti-reflective coatings on both outside surfaces. Their performance is superior to that of all single element lenses. 

Optica also manufactures custom optical elements, including: 

• Negative achromats 

• Lenses designed for finite conjugate systems 

• Lenses whose designs have been optimized for other wavelength areas, such as the ultraviolet or near infrared 

LensDrawingApplicationMaterial
Achromatic lensachromatic lensThese lenses have considerably reduced values of spherical aberrations. Best used to replace single components where performance must be improved.Combinations of Two Optical Grade Glassesn
SpecificationGrade
MaterialBK7
Diameter Size10mm To Maximumn
Dimension Tolerance+0/-0.2mm
Thickness Tolerance+0.0, -0.03mmn
Angle Of Incidence45`
Effective Focal Length+or-2%
Surface Quality60/40 scratch and dig
Clear Aperture>80%
CoatingCustom
  • Other Diameter / Thickness Available on Request 

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