System and method for measuring spatial coherence based on triangular digital holography
A spatial coherence and digital holography technology, which is applied in the field of optical interferometry and incoherent digital holography technology, can solve problems such as no experimental research, and achieve the effect of simple algorithm
Active Publication Date: 2016-06-01
BEIJING UNIV OF TECH
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I. Weingartner proposed the use of image plane holography to measure the mutual coherence function, and gave the principles of image plane holography optical recording, optical reproduction and spatial coherence in reconstructed images, but did not give any experimental research
No method has been reported to measure the spatial coherence of light fields using incoherent holography
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[0024] The following describes the process of measuring spatial coherence based on triangular digital holography with the accompanying drawings:
[0025] The schematic diagram of the optical path of this embodiment is as figure 1 Shown: the photographing light route of the hologram is white light source (1), condensing lens (2), aperture stop (3), filter (4), linear polarizer I (5), collimating lens (6) , Polarization beam splitter prism (7), lens I (8), mirror I (9) and mirror II (10), lens II (11), wave plate I (12) and wave plate II (13), line It consists of polarizer II (14) and image detector (15). The incident light from the white light source (1) passes through the converging lens (2), aperture stop (3), filter (4), linear polarizer I (5), collimating lens (6), and quasi-monochromatic parallel light in turn When incident on the surface of the polarization beam splitting prism (7), the transmitted light passes through lens II (11), mirror II (10) and mirror I (9) and passe...
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The invention discloses a system and a method for measuring spatial coherence based on triangular digital holography, and the system and the method belong to the fields of optical interferometry and incoherent holography application. The system adopts an incoherent white light source for illumination in a light path, and adds an interference filter for narrow-band filtering, so as to change the light emitted by the white light source into quasi monochromatic light. The quasi monochromatic light is irradiated to an aperture plane and then divided into two beams by a beam splitter, the two beams of light waves respectively propagate along clockwise and counterclockwise directions of the light path of the system, and an image sensor is placed on a far-field emergent plane of two light beams for receiving holograms formed by interference. The phase difference of the two beams of light waves is changed through the combination of wave plates, four holograms are recorded, and a complex value hologram is obtained by superposing the four holograms. Complex amplitude of the complex value hologram is a mutual coherence function of a corresponding point pair on a given plane, and the amplitude and phase of the mutual coherence function are extracted for describing spatial coherence of the point pair. A aperture diaphragm on the aperture plane is vertical to an optical axis of the system and moves in a write-in plane and in a plane which is perpendicular to the write-in plane, a series of holograms are acquired, and the spatial coherence of a light field in two-dimensional directions can be obtained.
Description
Technical field [0001] The invention discloses a system and method for measuring the spatial coherence of light fields based on the principle of triangular digital holography, and belongs to the technical application fields of optical interferometry and incoherent digital holography. Background technique [0002] The coherence of the light source contains important information of the light field, which has important research significance for both theoretical analysis and practical applications. Quantitative measurement of the coherence of light fields has always been an important research topic in the field of optics. The most classic methods of measuring the coherence of light sources are the Michelson interferometer to measure the time coherence and the Young's double-slit interferometer to measure the spatial coherence. Young’s double-slit interference experiment is simple in principle, but to measure the spatial coherence of the entire light field in a given plane, it is nec...
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IPC IPC(8): G01J9/02G03H1/12G03H1/14
Inventor 万玉红满天龙江竹青王大勇
Owner BEIJING UNIV OF TECH