title: Conjugate phase plate use in analysis of the frequency response of imaging systems designed for extended depth of field.
abstract: We unveil a relationship between generating a point spread function with a pair of conjugate phase elements and visualizing the modulation transfer function (MTF) of a single phase element for a variable focus error, at a tunable spatial frequency. We show that the defocused MTF of a pair of conjugate phase elements can be expressed as the modulus of the second order ambiguity function of a single phase element. Finally, we propose a tunable wavefront coding technique with a pair of quartic (4th power) conjugate phase elements.
authors.affiliation: University of Guanajuato, Campus Salamanca, Guanajuato 36730, México.
authors.forename: Jorge
authors.initials: J
authors.lastname: Ojeda-Castañeda
authors.forename: J E A
authors.initials: JE
authors.lastname: Landgrave
authors.forename: Cristina M
authors.initials: CM
authors.lastname: Gómez-Sarabia