US 12,372,924 B2 · Complex diversity for accurate phase retrieval with single shot acquisition

Abstract

A new diversity concept is provided for achieving accurate phase retrieval with a single shot acquisition. Multiple irradiance data are obtained by a diffractive grating or CGH designed to generate multiple diffraction orders with different diversity values. The effective filters associated with the individual diffraction orders from the diffractive grating or CGH are calculated. The effective filters are extracted by numerical propagation, and they preferably include both real and imaginary values, which signify both absorption and phase shift versus position in the filter plane. The reconstruction process utilizes accurate knowledge of the effective filters for each diffraction order for high quality reconstruction of the extrinsic phase.

Claims18

Dependent claims

A method for performing phase retrieval in an optics system, the method comprising:

using a computer-generated hologram (CGH) to generate a single-shot irradiance pattern comprising N phasorgrams derived from a single image acquisition, where N is a positive integer that is greater than or equal to 2, the CGH having a design that is based on a preselected set of seed filters associated with an estimated extrinsic aberration in the optics system;
measuring the single-shot irradiance pattern comprising the N phasorgrams with an optical detector;
and
retrieving an estimated extrinsic complex field in a pupil plane of the optics system by performing a reconstruction algorithm that uses N effective filters that have previously been extracted by an extraction algorithm that processes one or more single-shot irradiance patterns generated using the CGH to obtain the N effective filters.

1 more element

An optics system comprising:

a computer-generated hologram (CGH) configured to generate a single-shot irradiance pattern comprising N phasorgrams derived from a single image acquisition, where N is a positive integer that is greater than or equal to 2, the CGH having a design that is based on a preselected set of seed filters associated with an estimated extrinsic aberration in the optics system;
an optical detector configured to measure the single-shot irradiance pattern comprising the N phasorgrams;
and
a processor configured to perform a reconstruction algorithm that retrieves an estimated extrinsic complex field in a pupil plane of the optics system, wherein the reconstruction algorithm uses N effective filters that have previously been extracted by an extraction algorithm that processes the single-shot irradiance pattern generated using the CGH to obtain the N effective filters.

1 more element

A complex diversity computer program for performing phase retrieval in an optics system, the program comprising computer instructions for execution by a processor of the optics system, the computer instructions being embodied on a non-transitory computer-readable medium, wherein the optics system comprises a computer-generated hologram (CGH) configured to generate a single-shot irradiance pattern comprising N phasorgrams derived from a single image acquisition, where N is a positive integer that is greater than or equal to 2, the CGH having a design that is based on a preselected set of seed filters associated with an estimated extrinsic aberration in the optics system, an optical detector of the optics system being configured to measure the single-shot irradiance pattern, the computer instructions comprising:

a reconstruction algorithm that retrieves an estimated extrinsic complex field in a pupil plane of the optics system by using N effective filters that have previously been extracted by an extraction algorithm that processes the single-shot irradiance pattern generated using the CGH to obtain the N effective filters.

Dependencies are inferred from the claim text.

Complex diversity for accurate phase retrieval with single shot acquisition

Life of this patent

Complex diversity for accurate phase retrieval with single shot acquisition

Life of this patent

Abstract

Claims18