نتایج جستجو برای: holography
تعداد نتایج: 9186 فیلتر نتایج به سال:
Heterodyne holography is a variant of phase shifting holography in which reference and signal arms are controlled by acousto optic modulators. We will briefly describe the method and illustrate its advantages on experimental examples. OCIS codes: 090.1995: Holography: Digital holography, 040.2840: DetectorsHeterodyne Citation M. Gross, ”Heterodyne Holography: An Optimal and Versatile 2D Detecti...
The development of a transmission electron microscope equipped with a field emission gun paved the way for electron holography to be put to practical use in various fields. In this paper, we review three advanced electron holography techniques: on-line real-time electron holography, three-dimensional (3D) tomographic holography and phase-shifting electron holography, which are becoming importan...
We propose a digital holography reconstruction method using convolution approach rather than the conventional Fresnel approach. Simultaneously, we propose a 3D measurement system of phase-shift digital holography using principle of light detector. Using proposal method, we develop a compact 3D measurement system of phase-shift digital holography with low price and high measurement accuracy. Key...
We present an original heterodyne holography method for digital holography that relies on two-dimensional heterodyne detection to record the phase and the amplitude of a field. The technique has been tested on objects as much as 13 mm in size. Consistency checks were performed, and high-resolution images were computed. We show the requirement for a spatial filter to select properly sampled near...
Digital holography appears to be the next-generation technology for holographic diagnostics of particle fields and has been applied to holographic particle tracking flow measurements. In the digital holography, the Fresnel or Fourier holograms are recorded directly by the CCD or CMOS cameras and stored digitally. No film material involving wet-chemical or other processing is necessary as in opt...
We present a method of recording digital Fourier holograms under incoherent illumination, using a significantly reduced number of observed perspective projections and a digital prediction of the middle projections. The method is demonstrated experimentally. 2007 Optical Society of America OCIS codes: (090.0090) Holography; (090.0090) Digital holography; (090.1760) Computer holography; (100.689...
2.4. 2.5. 2.6. Pulse shaping by linear filtering Picosecond pulse shaping Fourier synthesis of femtosecond optical waveforms 2.3.1. Fixed masks fabricated using microlithography 2.3.2. Spatial light modulators (SLMs) for programmable pulse shaping 2.3.2.1. Pulse shaping using liquid crystal modulator arrays 2.3.2.2. Pulse shaping using acousto-optic deflectors 2.3.3. Movable and deformable mirr...
The principle and the applications of a recently proposed unconventional holography technique, called coherence holography, and a related technique for dispersion-free 3-D coherence imaging based on a spatial frequency comb will be reviewed. ©2007 Optical Society of America OCIS codes: (090.0090) Holography; (030.1640) Coherence; (100.3010) Image reconstruction techniques; (110.4500) Optical co...
We present and experimentally demonstrate a new, efficient, direct, and accurate method of obtaining a modified Fresnel hologram under incoherent illumination by directly processing the projections of the three dimensional scene, and without using approximations. 2007 Optical Society of America OCIS codes: (090.0090) Holography; (090.1760) Computer holography; (090.1995) Digital holography; (1...
A single-exposure in-line (SEOL) holography is a digital holographic setup that has been used in the study of cell identification. In this paper we demonstrate improved three-dimensional performance of the SEOL holography setup by applying the principles of the recently introduced compressive-sensing theory. This, along with proper modeling of the sensing process, enables improved depth-resolut...
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