Asymmetric phase masks for extended depth of field.

We present a family of asymmetric phase masks that extends the depth of field of an optical system. To verify our proposal, we compute several modulation transfer functions with focus errors, and we report numerical simulations of the images that can be achieved by use of our proposed procedure.

[1]  A. Lohmann,et al.  The ambiguity function as a polar display of the OTF , 1983 .

[2]  J Ojeda-Castaneda,et al.  High focal depth by apodization and digital restoration. , 1988, Applied optics.

[3]  W. Cathey,et al.  Extended depth of field through wave-front coding. , 1995, Applied optics.

[4]  Edward R. Dowski,et al.  Wavefront coding: a modern method of achieving high-performance and/or low-cost imaging systems , 1999, Optics & Photonics.

[5]  J Ojeda-Castañeda,et al.  Simultaneous Cartesian coordinate display of defocused optical transfer functions. , 1998, Optics letters.

[6]  Andrew R Harvey,et al.  Phase pupil functions for reduction of defocus and spherical aberrations. , 2003, Optics letters.

[7]  J. Ojeda-Castañeda,et al.  Annular apodizers for low sensitivity to defocus and to spherical aberration. , 1986, Optics letters.

[8]  A. Lohmann.  A new class of varifocal lenses. , 1970, Applied optics.

[9]  J. Mcleod.  The Axicon: A New Type of Optical Element , 1954 .

[10]  Albertina Castro,et al.  Phase mask for high focal depth , 1999, Other Conferences.

[11]  G. Häusler,et al.  A method to increase the depth of focus by two step image processing , 1972 .

[12]  J Ojeda-Castañeda,et al.  Bessel annular apodizers: imaging characteristics. , 1987, Applied optics.

[13]  J Ojeda-Castañeda,et al.  Arbitrarily high focal depth with finite apertures. , 1988, Optics letters.

[14]  J Ojeda-Castañeda,et al.  Ambiguity function as a design tool for high focal depth. , 1988, Applied optics.

[15]  M. Mino,et al.  Improvement in the OTF of a Defocused Optical System Through the Use of Shaded Apertures. , 1971, Applied optics.