An optimization design for mechanically compensated two-group zoom lenses for night vision applications is presented. Two optimization algorithms combined with a merit function and the damped least-squares method are proposed and used for optimization of each lens-group. This optical lens design should be
good enough to meet the performance requirements
for an image intensifier tube. The
proposed zoom system consists of a negative and a positive lens-group structure with one
aspheric lens and seven
glass lenses. The design result of zoom lenses includes spectral range of
600-900 nm, focal length range of 12-35 mm, zoom ratio of 2.9, the
maximum full-field angle of 74° and
f-number of
1.9-2.3. The total length of the zoom system is less than 200 mm. The design
results show that the best performance can be obtained by our proposed
approach.
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