Wavefront Modulation for an Elongated Depth of Focus with a Homogeneous Point Spread Function

Details Wavefront Modulation for an Elongated Depth of Focus with a Homogeneous Point Spread Function Wavefront Modulation for an Elongated Depth of Focus with a Homogeneous Point Spread Function

Apr 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aipc.1236..254i&link_type=abstract

INTERNATIONAL CONFERENCE ON ADVANCED PHASE MEASUREMENT METHODS IN OPTICS AND IMAGING. AIP Conference Proceedings, Volume 1236,

Physics

Optics

Liquid Crystal Devices, Optical Modulation, Polarization, Light Diffraction, Laser Beam Effects, Display Devices, Liquid-Crystal Devices, Modulation And Optical Transfer Functions, Polarization, Diffraction And Scattering, Laser Materials

Scientific paper

We present a pure phase pupil filter design for an extended depth of focus (DoF) with a homogeneous transversal behavior. State of the ort solutions base on complex (amplitude and phase) modulation or on diffractive phase filters, which have either low conversion efficiency due to the blocking of light or very complex structures. Our design is a quartic multiplex phase-only function with good performance and simple annular structure. Numerical simulation based on the Kirchhoff diffraction integral and experiments performed with a modulation transfer function measurement system combined with a spatial phase modulation liquid crystal device show in agreement a three times enlarged focal depth with homogeneous transversal spot size. Further simulations suggest that the depth of focus can be extended up to a factor 12. However, when using monochromatic polarized light interference effects disturb the uniform intensity along the focal depth.

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