INVESTIGADORES
IEMMI Claudio Cesar
artículos
Título:
Depth of focus increase by multiplexing programmable diffractive lenses.
Autor/es:
C. IEMMI; J. CAMPOS; J. ESCALERA; O. LÓPEZ CORONADO; R. GIMENO; M. YZUEL
Revista:
OPTICS EXPRESS
Editorial:
Optical Society of America
Referencias:
Año: 2006 vol. 14 p. 10207 - 10219
ISSN:
1094-4087
Resumen:
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.