The performance of Alvarez lenses is sensitive to the misalignment of lens elements. To improve the alignment accuracy and hence the lens performance, a feasible active alignment mechanism is proposed in this paper. Four micro lenses are created on the corners of the lens elements, forming two afocal lens pairs when the two lens elements are stacked. By monitoring the position of the laser spot coming from the afocal lens pair, the relative position of the two lens elements can be controlled precisely. The results show that an alignment accuracy less than 10 μm is achievable. Such an alignment mechanism would be useful in future solid tunable lens designs.
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