Phase-retrieval-based algorithms for far-field beam steering and shaping

1999 ◽  
Author(s):  
Byron M. Welsh ◽  
Michael C. Roggemann ◽  
Greg L. Wilson
Keyword(s):  
Phase Retrieval ◽  
Beam Steering ◽  
Far Field

Simulation and experimental results for a phase retrieval-based algorithm for far-field beam steering and shaping

2002 ◽  
Author(s):  
Michael C. Roggemann ◽  
Byron M. Welsh ◽  
Bradley R. Stone ◽  
Ting Ei Su
Keyword(s):  
Phase Retrieval ◽  
Beam Steering ◽  
Experimental Results ◽  
Far Field

Small-phase retrieval using single focused far-field intensity

Optik ◽  
2020 ◽  
Vol 218 ◽  
pp. 164904
Author(s):  
Qian Ye ◽  
Dafei Xiao
Keyword(s):  
Field Intensity ◽  
Phase Retrieval ◽  
Far Field ◽  
Small Phase

Near-field far-field predictions from single-intensity-planar-scan phase retrieval

1989 ◽  
Vol 25 (8) ◽  
pp. 519 ◽  
Author(s):  
A.P. Anderson ◽  
G. Junkin ◽  
J.E. McCormack
Keyword(s):  
Phase Retrieval ◽  
Near Field ◽  
Far Field

scholarly journals Small-phase retrieval with a single far-field image

2008 ◽  
Vol 16 (11) ◽  
pp. 8190 ◽  
Author(s):  
Min Li ◽  
Xin-Yang Li ◽  
Wen-Han Jiang
Keyword(s):  
Phase Retrieval ◽  
Far Field ◽  
Small Phase

Miniaturized beamsplitters realized by X-ray waveguides

2016 ◽  
Vol 72 (5) ◽  
pp. 515-522 ◽  
Author(s):  
Sarah Hoffmann-Urlaub ◽  
Tim Salditt
Keyword(s):  
Interference Pattern ◽  
Phase Retrieval ◽  
Near Field ◽  
Retrieval Algorithm ◽  
Far Field ◽  
X Ray ◽  
Reconstructed Field ◽  
Propagation Methods ◽  
Cladding Material

This paper reports on the fabrication and characterization of X-ray waveguide beamsplitters. The waveguide channels were manufactured by electron-beam lithography, reactive ion etching and wafer bonding techniques, with an empty (air) channel forming the guiding layer and silicon the cladding material. A focused synchrotron beam is efficiently coupled into the input channel. The beam is guided and split into two channels with a controlled (and tunable) distance at the exit of the waveguide chip. After free-space propagation and diffraction broadening, the two beams interfere and form a double-slit interference pattern in the far-field. From the recorded far-field, the near-field was reconstructed by a phase retrieval algorithm (error reduction), which was found to be extremely reliable for the two-channel setting. By numerical propagation methods, the reconstructed field was then propagated along the optical axis, to investigate the formation of the interference pattern from the two overlapping beams. Interestingly, phase vortices were observed and analysed.

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