Products
Materials: 1pc crown glass with low refractive index and 2pcs of flint glass with high refractive index
Diameter: 1.5-300mm
Diameter Tolerance: +/-0.1 mm
Thickness Tolerance: +/-0.5mm
Centring Error: <3 Arc minutes
Surface Quality: 20-10
Surface Figure: λ/10@633nm
Clear Aperture: 90%
Coating: Specified by customers
A triplet lens is cemented by one piece of crown glass with low refractive index and two pieces of flint glass with high refractive index, normally the cemented lens can eliminate spherical chromatic aberration of axial direction. Because the design of these lenses are complete symmetrical, so they can be used by changing-over. The commonly used materials include crown glass and flint glass.
Triplet Achromatic Lenses are designed for 1:1 conjugate ratios and utilize symmetry to correct for aberrations. They are made from a low index center element cemented between two identical high index outer elements. Each lens is edged down to f-numbers with reasonable aberration correction at increased fields. Some medical instrument use micro triplet lenses.
CaF2 Fused Silica CaF2 Triplet Lenses
Triplet achromatic lenses offer excellent performance in chromatic and aberration correction and are suitable for high precision optical systems, but have higher cost, weight and assembly complexity. The choice needs to be weighed against the specific needs of the application.
Triplet achromatic lenses made of fused silica(SiO2) and calcium fluoride(CaF2) materials are used to correct chromatic aberration mainly through the different dispersion characteristics of these two materials.
