White light hologram

Holograms as videos

Submitted by Jürgen Tenckhoff on Sat, 09/26/2020 - 18:22

The three-dimensional effect of holograms is particularly impressive when the viewer can move around and see the holographic motif from several sides. If you photograph holograms, you inevitably only depict one viewing angle and get a two-dimensional impression.

For this article, we mounted holograms on a rotating body and let them rotate slowly around the vertical axis when illuminated with parallel light. The holographic motif was recorded as HD video with a Nikon D850.

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Holographic art in Pulheim Town Hall

Submitted by Jürgen Tenckhoff on Fri, 09/25/2020 - 18:37

At the end of the 1990s, the Holography Museum was closed by Matthias Lauk and its approximately 350 exhibits were looking for new owners. In order to be able to assess holographic art, the view must not be obscured by 3D animations, stereoscopic images or simulated pseudo-3D effects with red-green orthogonal glasses. Otherwise the careless assessment of the ignorant takes place too quickly, one is on the level of souvenir articles.

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Holography Museum Lauk in Pulheim

Submitted by Jürgen Tenckhoff on Fri, 09/25/2020 - 16:58

In October 1982 I published an article entitled "Laser technology - breakthrough successful" as the specialist editor of "Idea - Das Magazin für Ingenieure". Since holography was one of my areas of specialization during my studies at the Ruhr University in Bochum, this interesting and future-oriented technology should of course not be missing. In order to cover the wide range of their areas of application, e.g. to round off the nondestructive testing of materials, etc., the artistic aspects of holography should also be examined. While researching, I found Mr.

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Rainbow holograms in art

Submitted by Jürgen Tenckhoff on Fri, 09/25/2020 - 15:47

This example nicely shows the special effect of rainbow holograms: If you tilt them around the horizontal axis, the photo runs through the spectral colors. If you move them around the vertical axis, they show the three-dimensionality of the recorded object. This opens up many possibilities for art projects, since with this method you not only have three representable dimensions but also colors for designing the art object.

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Holography with argon laser

Submitted by Jürgen Tenckhoff on Fri, 09/25/2020 - 13:40

White light holograms are generated with coherent laser light (here an argon laser), but they meet lower coherence conditions when viewing. The recorded objects show up in parallel light, so that lasers can be dispensed with. This makes them very suitable for artistic projects.

This test recording was taken in 1979 at the chair for theoretical electrical engineering at the Ruhr University in Bochum.

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Half a hologram - all the information

Submitted by Jürgen Tenckhoff on Fri, 09/25/2020 - 12:45

Is there really all the information of a recorded motif in every fragment of a hologram? In this example, a broken photo plate is supposed to show us whether we can reconstruct the white-light hologram of a helicopter recorded in it. The photo plate was rotated again in 1-degree steps to the reference wave (focused beam of a light-emitting diode flashlight) for each individual photo, so that several views of the three-dimensional object can be observed from the recorded wave field (light amplitude and phase) of the

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Holography for science and art

Submitted by Jürgen Tenckhoff on Thu, 09/24/2020 - 18:11

While the intensity (amplitude) of the light is recorded in black and white photography, color photography also uses its frequency. In this way, two-dimensional images of our four-dimensional world are generated, which, with the appropriate image composition, can also create a perspective-spatial, three-dimensional impression and, through the choice and representation of a suitable motif, can also create the impression of a temporal component.

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