Totagraphy: coherent diffractive/digital information reconstruction by iterative phase recovery using reference wave
AssigneeWavefront Analysis Systems LLC
InventorOkan Ersoy
Life of this patent
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Abstract
A totagram is produced by an iterative spectral phase recovery process resulting in complete information recovery using special masks and using a reference beam. Using these special masking systems reduce computation time, number of masks, and number of iterations. Adding a reference wave to the iterative process provides better phase recovery systems and aid in the preventing of phase wrapping. The reference wave is added on-axis to provide a well-controlled amplitude. The reference wave is added after the physical or digital transformation system and subtracted before recording the initial amplitude.
Claims25
A method for recovering phase information of an input from a coherent wave, the method comprising:
- providing at least one transformation unit with an input plane and an output plane;
- providing at least two masks one of which is a unity mask, each of the at least two masks configured to be disposed at the input plane;
- separately applying the coherent wave at the input plane to each of the at least two masks to generate a modified input from each of the masks;
- passing the modified inputs through the at least one transformation unit, wherein the at least one transformation units performs a generalized Fourier transform on each modified input to produce at its output plane a transformed modified input from each modified input;
- combining a reference wave with each transformed modified input to produce a combined wave from each transformed modified input;
- recording amplitude values at an array of points of each combined wave to produce phasorgrams;
- associating a phase value with each point on each phasorgram to form a plurality of complex phasorgrams;
- subtracting the reference wave from each of the complex phasorgrams;
- and
- iteratively processing the plurality of complex phasorgrams after having been through subtraction, until convergence is achieved to produce a totagram constituting a reconstructed input with amplitude and phase information.
A system for recovering phase information of an input from a coherent wave comprising:
- a transformation unit having an input plane and an output;
- at least two masks, one of which is a unity mask, each of the at least two masks being disposed at the input plane of the transformation unit for receiving the coherent wave;
- wherein the at least two masks are configured to separately modify the coherent wave, and wherein the transformation unit effects a generalized Fourier transform on each of the separately modified waves to produce a transformed wave from each of the separately modified waves;
- a reference wave source;
- an optical beam combiner which combines the reference wave with each transformed wave to produce a combined wave from each transformed wave;
- at least one sensor system configured to record amplitude values at an array of points of each combined wave to produce a phasorgram from each combined wave;
- and
- a digital processor configured to:
- associate a phase value with each point on each phasorgram to form a plurality of complex phasorgrams;
- subtract the reference wave from each of the complex phasorgrams;
- and then iteratively process the plurality of complex phasorgrams until convergence is achieved to produce a totagram constituting a reconstructed input wave with amplitude and phase information.
Dependencies are inferred from the claim text.