Spatial light modulators with large phase-modulation: application to encode lenses with very short focal lengths

Jeffrey A. Davis; Benjamin K. Gutierrez; Ignacio Moreno; Don M. Cottrell

doi:10.1117/12.2545588

26 February 2020 Spatial light modulators with large phase-modulation: application to encode lenses with very short focal lengths

Jeffrey A. Davis, Benjamin K. Gutierrez, Ignacio Moreno, Don M. Cottrell

Author Affiliations +

Proceedings Volume 11304, Advances in Display Technologies X; 113040C (2020) https://doi.org/10.1117/12.2545588
Event: SPIE OPTO, 2020, San Francisco, California, United States

Abstract

In standard phase spatial light modulators (SLM), showing a phase modulation of 2π 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 2π 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.

Conference Presentation

Citation Download Citation

Jeffrey A. Davis, Benjamin K. Gutierrez, Ignacio Moreno, and Don M. Cottrell "Spatial light modulators with large phase-modulation: application to encode lenses with very short focal lengths", Proc. SPIE 11304, Advances in Display Technologies X, 113040C (26 February 2020); https://doi.org/10.1117/12.2545588

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