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A given hologram will have one or other of each of these three properties, e.g. an amplitude modulated, thin, transmission hologram, or a phase modulated, volume, reflection hologram. Amplitude and phase modulation holograms
The hologram keeps the information on the amplitude and phase of the field. Several holograms may keep information about the same distribution of light, emitted to various directions. The numerical analysis of such holograms allows one to emulate large numerical aperture, which, in turn, enables enhancement of the resolution of optical microscopy.
A reflective volume hologram is used to extract progressively a collimated image that was directed via total internal reflection in an optical waveguide. The spectral and angular Bragg selectivity of the reflective volume hologram makes it particularly well-suited for a combiner using such light sources as RGB LEDs , providing both good see ...
1962 – Yuri Denisyuk invented the white-light reflection hologram which was the first hologram that could be viewed under the light given off by an ordinary incandescent light bulb. [1] 1968 – White-light transmission holography was invented by Stephen Benton. This type of holography was unique because it was able to reproduce the entire ...
This hologram is a transmission hologram, where the hologram is illuminated on one side, and viewed from the other. Illumination and viewing can be done from the same side, if the hologram is mounted onto a reflective surface. Mass replication of such holograms can be done using an embossing process. [3]
The first reports of replacing the photographic hologram of classical holography by digitally recording the hologram and numerically reconstructing the image in a computer were published in the late 1960s [60] and in the early 1970s. [61] [62] Similar ideas were proposed for the electron microscope in the early 1980s. [63]
The agreement of the other field with the red arrows reveals an alternative definition of the sign convention: that a positive reflection or transmission coefficient is one for which the field vector in the plane of incidence points towards the same medium before and after reflection or transmission.
When recording a classical hologram, the bright reference beam is typically arranged to strike the film in the p polarization at Brewster's angle. By thus eliminating reflection of the reference beam at the transparent back surface of the holographic film, unwanted interference effects in the resulting hologram are avoided.