Achromatic Lens is an achromatic c***ists 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 w***elengths, usually in the blue and red region of the spectrum. Focal length is c***tant at those two w***elengths and focal length shifts are virtually eliminated across the visible w***elengths. 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 w***elengths, spherical aberration and coma are greatly reduced.
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/-0.05
*Center thickness tolerance:+/-0.1
*Surface quality: 60-40 Scrath/Dig
*Surface figure:0.5-0.2
*Centration < 3arc min
*Chamfer:0.1-0.25*45 degrees
*Design w***elength:486.1mm,587.6mm,656.3mm
(the parameter is demision of nomal lens,so specification will be changed according to different demision and material)