| 摘要 |
Variable focus lens assembly, including a first lens group with positive optical power, a second lens group with positive optical power, and an adjuster structured to be capable of adjusting a separation between the first lens group and the second lens group. The variable focus lens assembly has a numerical aperture greater than about 0.65. A variable focus lens assembly includes a first lens group that is moveable on an axis, the first lens group being well-corrected and having a numerical aperture of at least about 0.20, and a second, fixed lens group sharing the axis of the first lens group. A distance between the first lens group and the second lens group may be varied over a range. The variable focus lens assembly has a spot size which is diffraction limited over the range of distance separating the first lens group and the second lens group. The variable focus lens assembly has a numerical aperture of at least about 0.65. Methods for examining or treating one of a transparent and a semi-transparent object with a variable focus lens assembly.
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