What is phase holography?
onto a wave by phase modulation, giving rise to the original. wave, a conjugate wave, and other waves described by A02. and. A2. (x,y) could be called phase holography.
What is phase shifting holography?
A new method for three-dimensional image formation is proposed in which the distribution of complex amplitude at a plane is measured by phase-shifting interferometry and then Fresnel transformed by a digital computer. Image formation of three-dimensional (3-D) objects is important for display and optical measurement.
What are the different types of holograms?
There are three types of holograms: the reflection hologram, transmission hologram, and then the hybrid (combination of both).
What kind of light is used to produce hologram images?
Most holograms created by artists are made with lasers. A laser can produce ‘monochromatic’ light that is a single color and wavelength, i.e. green light with a wavelength of 532nm.
What is the difference between holography and hologram?
is that holography is (physics) a technique for recording, and then reconstructing, the amplitude and phase distributions of a coherent wave disturbance; used to produce three-dimensional images or holograms while hologram is a three-dimensional image of an object created by holography.
What is holography explain?
Holography is a technique that enables a wavefront to be recorded and later re-constructed. A hologram is made by superimposing a second wavefront (normally called the reference beam) on the wavefront of interest, thereby generating an interference pattern which is recorded on a physical medium.
What is phase-shifting digital holography?
The phase-shifting (or phase-stepped) digital holography process entails capturing multiple interferograms that each indicate the optical phase relationships between light returned from all points on the illuminated object and a controlled reference beam of light.
What is holography?
Holography is the science and practice of making holograms. Typically, a hologram is a photographic recording of a light field, rather than of an image formed by a lens, and it is used to display a fully three-dimensional image of the holographed subject, which is seen without the aid of special glasses or other intermediate optics.
What is computer-generated holography (CGH)?
Computer-generated holography ( CGH) is the method of digitally generating holographic interference patterns. A holographic image can be generated e.g. by digitally computing a holographic interference pattern and printing it onto a mask or film for subsequent illumination by suitable coherent light source.
How is a hologram made?
A phase hologram is made by changing either the thickness or the refractive index of the material in proportion to the intensity of the holographic interference pattern. This is a phase grating and it can be shown that when such a plate is illuminated by the original reference beam, it reconstructs the original object wavefront.