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(a) Optical setup using the Shack–Hartmann wave front sensor. The wave front sensor is operated in the transmission mode and the liquid microlens is illuminated by a collimated light. Relay lenses are used to conjugate liquid lens plane LL′ with wave front sensor plane SS′ and to enlarge the wave front by a factor of 2. (b) Picture of the experiment setup. It consists of a laser source, a beam expander, mirrors, a sample lens on a stage, relay lenses, and a wave front sensor.
