Abstract

In standard phase spatial light modulators (SLM), showing a phase modulation of 2<i>&pi;</i> radians, there is a limit to the shortest focal length of an encoded lens. This Nyquist focal length limit is caused by the aliasing originated by the SLM pixelated structure. In this work we show that SLMs with very large phase modulation (in our case about five cycles of 2<i>&pi;</i> radians) can be used to surpass this effect and efficiently encode lenses with focal lengths much lower than the Nyquist limit. We include experimental results showing that this limit is reduced by a factor of about 1/10.

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