An Incoherent Digital Holographic Acquisition Method Based on Phase Shift Technology

A digital hologram and phase-shifting interference technology, which is applied in the direction of instruments, can solve problems affecting the expansion of the original optical path, and achieve the effects of improving the quality of reproduced images, facilitating connection with display systems, and wide recording bandwidth

Active Publication Date: 2019-09-13
PEKING UNIV
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Problems solved by technology

However, the above methods improve the recording quality by changing the structure of the original optical path, which will affect the scalability of the original optical path.

Method used

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  • An Incoherent Digital Holographic Acquisition Method Based on Phase Shift Technology
  • An Incoherent Digital Holographic Acquisition Method Based on Phase Shift Technology
  • An Incoherent Digital Holographic Acquisition Method Based on Phase Shift Technology

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Embodiment Construction

[0020] The invention adopts the non-coherent digital hologram recording method of phase-shift interference, and the method processes the non-coherent digital hologram based on the four-step phase-shift interference technology to achieve the purpose of improving the quality of the recorded hologram, and the reproduced image can be applied to Three-dimensional stereoscopic display; the non-coherent digital hologram recording method using phase-shift interference specifically includes the following steps:

[0021] 1) The object light wave is collimated, and after passing through the lens, the angle is adjusted (the incident angle is kept at about 40 degrees) and irradiated onto the SLM plane.

[0022] 2) The SLM works in the phase modulation mode, and loads the corresponding phase distribution diagrams sequentially. After the object light wave is reflected by the SLM, it will be divided into two beams of self-coherent light waves, and since the phase map is loaded on the SLM, it ...

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Abstract

The invention discloses an incoherent digital holographic acquisition method based on a phase-shifting technology, and belongs to the field of digital image processing. A four-step phase-shifting technology is used in recordings of an incoherent digital hologram, combination of a phase-shifting interference technique with a FINCH system is provided, so that diffraction term interference in a reproductive image of the FINCH system can be effectively removed, and reproduction quality can be improved. The method can perform three-dimensional display using a SLM and other optical systems.

Description

technical field [0001] The invention belongs to the field of digital image processing, and relates to a non-coherent digital holographic acquisition method based on a phase shift technology, in particular to related methods such as the production and reproduction of non-coherent digital holograms. Background technique [0002] In 2007, J.Rosen proposed an incoherent digital holographic recording method: Fresnel Incoherent Correlation Holography ( FINCH), by loading the phase modulation mode through the SLM, the light emitted by each object point is split and self-coherent, and then incoherently superimposed to form an object hologram. Due to the high quality of the hologram obtained by this method, it has become the focus of people's research at present. [0003] Rosen's research group improved the coded aperture of the FINCH system in the document "Vijayakumar A, Kashter Y, Kelner R, et al. Coded Aperture Incoherent Digital Holography." Digital Holography and Three-Dimensi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G03H1/04G03H1/08G03H1/12
Inventor 杨光临姜鹏
Owner PEKING UNIV
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