Bonding achromatic lens is an achromatic consists of a positive low-index Crown Glass lens element cemented to a negative high-index Flint Glass lens element. The optical elements are chosen so
as to cancel chromatic aberration at two well-separated wavelengths, usually in the blue and red region of the spectrum. Focal length is constant at those two wavelengths and focal length shifts
are virtually eliminated across the visible wavelengths. One frequent use is to achieve diffraction limited focusing of a laser beam. Negative Achromatic doublet lenses are typically used when
there is a need to eliminate chromatic aberration. In addition to reducing chromatic aberration at the design wavelengths, spherical aberration and coma are greatly reduced. True Optics can
provide Positive Achromatic Lens and Negative Achromatic lens by two piece single lens (Doublet) or three piece single lens (Triplet).
Material: Clear Optical Glass
Surface Flatness: < λ/5 @ 633nm
Scratch/Dig: < 40/20 (both sides)
Eccentricity: ≤ 1arcmin
Focal Length Tolerance < ± 1%
Diameter Tolerance: < + 0.00/ -0.10mm
Thickness Tolerance: < ± 0.1
Clear Aperture: ≥ 90% of diameter AR OR
Coating: AR OR BBAR
Diameter Range: 5~260m
