摘要:
The present invention generally extends to methods, systems, and devices that advantageously employ holograms to store and retrieve information about objects, and to compare objects.
摘要:
Systems and methods for sub-aperture correlation based wavefront measurement in a thick sample and correction as a post processing technique for interferometric imaging to achieve near diffraction limited resolution are described. Theory, simulation and experimental results are presented for the case of full field interference microscopy. The inventive technique can be applied to any coherent interferometric imaging technique and does not require knowledge of any system parameters. In one embodiment of the present application, a fast and simple way to correct for defocus aberration is described. A variety of applications for the method are presented.
摘要:
An Interferometer for off-axis digital holographic microscopy includes a recording plane, and a grating located in a plane optically conjugated with the recording plane. The grating defining a first and a second optical path, the optical path corresponding to different diffraction order.
摘要:
The layered generation of at least one volume grating in a recording medium by way of exposure, the recording medium having at least one photosensitive layer which is sensitized for a presettable wavelength of the exposure light. Each volume grating is generated in the recording medium by at least two wave fronts of coherent light capable of generating interference, the wave fronts being superposed in the recording medium at a presettable depth, at a presettable angle and with a presettable interference contrast. The depth and the thickness of the refractive index modulation and/or transparency modulation of a volume grating in the recording medium is controlled by depth-specific control of the spatial and/or temporal degree of coherence of the interfering wave fronts in the direction of light propagation.
摘要:
A device for holographic reconstruction of three-dimensional scenes includes optical focusing means which directs sufficiently coherent light from light means to the eyes of at least one observer via a spatial light modulator that is encoded with holographic information. The device has a plurality of illumination units for illuminating the surface of the spatial light modulator; each unit comprises a focusing element, and a light means that emits sufficiently coherent light such that each of these illumination units illuminates one separate illuminated region of the surface, whereby the focusing element and the light means are arranged such that the light emitted by the light means coincides close to or at the observer eyes.
摘要:
For performing hologram recording or reproduction, an oscillation wavelength half value width Δλ of a coherent light source satisfies a relationship of Δλ
摘要:
The invention relates to information technologies and is intended for visualizing three-dimensional images. The technical result of the invention consists in creating electrically controlled three-dimensional phase diffraction gratings and, on their basis, screens for displaying three-dimensional color images. A method for visualizing images comprises directing a beam of broadband optical radiation at a matrix of electrically controlled elements, or pixels, the pixels being supplied with a voltage, its distribution over the matrix being calculated so as to produce a desired change in the current optical characteristics of the pixels, and viewing the image. Moreover, the beam of optical radiation is directed simultaneously at a stack of pixel matrixes in which the matrixes are arranged parallel to one another, the matrixes being irradiated from the side from which the image is viewed, the refraction index being used as a variable optical characteristic of pixels in all the matrixes. The device for performing the claimed method comprises a screen that is a multi-layered structure made of materials transparent to electromagnetic radiation within the optical range, the multi-layered structure comprising alternating layers of material displaying an electro-optical effect and layers of a transparent material that does not display an electro-optical effect, all the layers displaying an electro-optical effect being insulated electrically from one another and each of them being made as a matrix of electrically controlled elements, or pixels.
摘要:
Disclosed is a coherence-adjustable digital holography system. More particularly, the coherence-adjustable digital holography system includes a light source part for generating low-interference light; a dispersion part for dispersing the generated light, an adjustment part for adjusting coherence by adjusting a spectrum bandwidth of the light which has passed through the dispersion part; and a detection part for detecting a holographic image of a subject from the adjusted light. In accordance with such a configuration, an interference fringe may be easily obtained through coherence adjustment, whereby the accuracy of a detected holographic image may be improved.
摘要:
Systems and methods for sub-aperture correlation based wavefront measurement in a thick sample and correction as a post processing technique for interferometric imaging to achieve near diffraction limited resolution are described. Theory, simulation and experimental results are presented for the case of full field interference microscopy. The inventive technique can be applied to any coherent interferometric imaging technique and does not require knowledge of any system parameters. In one embodiment of the present application, a fast and simple way to correct for defocus aberration is described. A variety of applications for the method are presented.
摘要:
An Interferometer for off-axis digital holographic microscopy includes a recording plane, and a grating located in a plane optically conjugated with the recording plane. The grating defining a first and a second optical path, the optical path corresponding to different diffraction order.