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A device and method for non-iterative phase recovery under partially coherent light illumination

A phase recovery and coherent light technology, applied in the field of optics, can solve problems such as no longer applicable, inability to achieve fast information, real-time recovery, and inability to obtain a unique solution, and achieve a wide range of applications

Active Publication Date: 2022-07-12
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] However, these technologies have certain shortcomings and disadvantages. The iterative algorithm of the calculation phase recovery method requires a large number of iterations and iteration time. For complex phase objects, it is impossible to achieve fast and real-time recovery of information, and even the unique solution may not be obtained. Happening
Moreover, when the existing iterative algorithm processes partially coherent light, it assumes that the cross-correlation function of the light source is a Gaussian Schell mode, and uses mode expansion for processing. However, when the coherence is very low, a large number of modes are required to correctly recover the phase information. , and for light sources whose correlation function is unknown, the method of mode expansion will no longer be applicable

Method used

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  • A device and method for non-iterative phase recovery under partially coherent light illumination
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  • A device and method for non-iterative phase recovery under partially coherent light illumination

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Embodiment 1

[0057] Embodiment 1: Recovery of phase information of an object under Gaussian correlation partially coherent light illumination.

[0058] 1. The generation of a partially coherent light source with Gaussian correlation: its structure includes a power-adjustable semiconductor-pumped solid-state laser 1, which emits a laser wavelength of 532 nm, and the laser beam emitted by the laser is expanded by a beam expander 2. The beam after the beam is focused on the rotating ground glass sheet 5 by the focusing lens 4 , the scattered light is collimated by the collimating lens 6 , and then shaped by the Gaussian filter 7 . The light coming out of the Gaussian filter is the partially coherent light of the Gaussian correlation. Here, the focal length of the focusing lens 4 is 80 mm, and the focal length of the collimating lens 6 is 150 mm.

[0059] 1.1. Adjust the spatial coherence of the light source: The spatial coherence of the light source is directly related to the spot size focus...

Embodiment 2

[0066] Embodiment 2: Recovering the phase information of an object under the illumination of special associated partially coherent light.

[0067] 1. The generation of a special associated partially coherent light source: its structure includes a power-adjustable semiconductor-pumped solid-state laser 1 with a wavelength of 532 nm. The laser beam emitted by the laser is expanded by a beam expander 2, and the expanded beam After passing through the helical phase plate 3 with a topological charge number of 2, it is focused by the focusing lens 4 onto the rotating frosted glass plate 5. The scattered light is collimated by the collimating lens 6, and then shaped by the Gaussian filter 7. Here, the focal length of the focusing lens 4 is 80 mm, and the focal length of the collimating lens 6 is 150 mm. The light coming out of the Gaussian filter is the partially coherent light of the Laguerre-Gaussian correlation. The partially coherent light of the Laguerre-Gaussian correlation is...

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Abstract

The invention relates to a non-iterative phase recovery device and method under partially coherent light illumination, comprising a partially coherent light generating unit and an object phase measuring unit, wherein the partially coherent light generating unit includes a laser, a beam expander, a focusing lens, a rotating frosted glass A spiral phase plate can also be arranged between the beam expander and the focusing lens; the object phase measurement unit includes a beam splitter, a spatial light modulator, a reflector, a porous array plate, a Lie lenses, charge-coupled elements, and computers. Compared with the iterative algorithm, the present invention has a faster recovery process and can realize real-time object information recovery; compared with the mode expansion method, the invention has a wider application range and can realize object information recovery under partially coherent light illumination with unknown associated structure; At the same time, the method can be extended to lensless diffraction imaging of X-rays; it has the advantages of simple device, wide application range, fast recovery speed, etc., and has important application prospects.

Description

technical field [0001] The present invention relates to the field of optical technology, and in particular, to a non-iterative phase recovery device and method under partially coherent light illumination. Background technique [0002] For an unknown object containing amplitude and phase information, the amplitude information of the object can be directly observed through the charge-coupled element, but the phase information cannot be obtained directly. Therefore, how to obtain the phase information of the unknown object from the intensity information has become a research topic. an important subject. The technology of obtaining the phase information of the object from the intensity information is called wavefront detection technology or phase recovery. The method of obtaining the phase information of the object through diffraction or interference to realize two-dimensional and three-dimensional imaging is called coherent diffraction imaging, which is widely used in image inf...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G03H1/12
CPCG03H1/12
Inventor 卢兴园赵承良朱新蕾曾军蔡阳健
Owner SUZHOU UNIV