Description
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 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
Achromats 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.
We supply all kinds of achromatic lens as per your requested.
Specification of our achromatic lens as follow:
*Material:BK7 and ZF2(or according to your request)
*Dia.:*0/*0.*5
*Center thickness tolerance:+/*0.1
*Surface quality: ****0 Scrath/Dig
*Surface figure:0.**0.2
*Centration < 3arc min
*Chamfer:0.**0.*5**5 degrees
*Design wavelength:**6.1mm,**7.6mm,**6.3mm
(the parameter is demision of nomal lens,so specification will be
changed according to different demision and material)
