Achromat Lens

Achromat lens
achromatic doublet lenses have significantly better optical performance than singlet lenses in visible imaging and laser beam manipulation applications. Achromat lenses are consist of two elements, usually of a positive low-index crown glass cemented to a negative high-index flint glass that have been corrected for chromatic aberration with respect to two or more selected wavelengths. We provide achromatic lenses consisting of two elements. These lenses have considerably reduced not only chromatic aberration bust also spherical aberration and coma aberration. These are designed with respect to three wavelength 480.0nm, 546.1nm and 643.8nm.
Capacity:
material: optical glass.
Diameter: 0.5 to 350 mm
diameter tolerance: +0-0.02 mm
thickness tolerance: ±0.01 mm
surface quality: 10-5
surface figure: λ10
centration: 1 minute or 30 second
coating: uncoated, ar and hr
specification:
material bk7 grade a optical glass
design wavelength 480.0nm,546.1nm,643.8 nm
diameter tolerance +0.0, -0.15 mm
thickness tolerance ±0.2 mm
paraxial focal length ±2% @546.1 nm
centration 85%
surface irregularity λ4@632.8 nm
surface quality 60-40 scratch and dig
protective bevel 0.25 mm x 45°
 
 
positive achromatic lens standard products:
 
part no. f (mm) ф (mm) r1 (mm) r2=r3 (mm) r4   (mm) tc1
(mm) t c2
(mm) f b
(mm) lens
a lens  b
tpa101 10.0 6.0 6.546 -4.055 -23.23 3.6 0.8 7.54 sk9 sf15
tpa102 20.0 10.0 12.32 -0.902 -25.23 3.8 1.0 17.625 bk7 sf5
tpa103 30.0 12.7 18.535 -13.49 -37.84 4.0 1.3 27.36 bk7 sf5
tpa104 40.0 12.7 25.23 -17.539 -48.75 3.4 1.3 37.778 bk7 sf5
tpa105 50.0 18.0 31.69 -22.0 -60.57 4.8 1.5 46.987 bk7 sf5
note: other size, material and coating are available upon request.