Depth of focus increase by multiplexing programmable diffractive lenses

C. Iemmi, J. Campos, J. C. Escalera, O. López-Coronado, R. Gimeno, M. J. Yzuel

Research output: Contribution to journalArticleResearchpeer-review

26 Citations (Scopus)

Abstract

A combination of several diffractive lenses written onto a single programmable liquid crystal display (LCD) is proposed for increasing the Depth of Focus (DOF) of the imaging system as a whole. The lenses are spatially multiplexed in a random scheme onto the LCD. The axial irradiance distribution produced by each lens overlaps with the next one producing an extended focal depth. To compare the image quality of the multiplexed lenses, the Modulation Transfer Function (MTF) is calculated. Finally we obtain the experimental Point Spread Functions (PSF) for these multiplexed lenses and experimental results in which an extended object is illuminated under spatially incoherent monochromatic light. We compare the images obtained in the focal plane and in some defocused planes with the single lens and with three multiplexed lenses. The experimental results confirm that the multiplexed lenses produce a high increase in the depth of focus. © 2006 Optical Society of America.
Original languageEnglish
Pages (from-to)10207-10219
JournalOptics Express
Volume14
DOIs
Publication statusPublished - 1 Jan 2006

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