HOLOGRAPHY - part 1

[@dikshitarajkonwar5097]

I was 9 years old when this video was uploaded, but after 11 years have passed this is still the best demonstrated and well-explained video on holography.

[@GK1belfer]

Thanks, young Gentelman! I made it in 1979 when I was 39 years old...

[@theb1rd]

This is the best introduction to holography that I have seen.

[@RocketPropelledGuy]

If you are having trouble understanding how every single part of the hologram has the entire image recorded what you have probably forgotten to apply is an aspect of the wave character of light and the fact that the reference and object beam are off axis to each other and so do not meet the recording material at the same angle. Every single microscopic point of incidence the object beam had on the scene produced it's own wave, the phase of it altered according to the physical shape of the object and it's distance from the recording material (what focal plane the object is at is encoded too, even if other objects in the scene are at a different focal plane, though you don't see many holograms demonstrating that.) Though it is possible for a scene to have physical objects placed such that some of these waves will never meet each other (and thus not interfere) the reference beam will have it. Absolutely every single wave will cross the reference beam on the way to the recording material. This will alter the amplitude of the reference beam before it has intersected the next wave, before contacting the recording material. The reference beam continues on with the amplitude change of one wave and is then changed by another, having still been changed by the first one, again shifting the amplitude due to the phase subtle phase changes, while the object beam reflections continues into the medium, its amplitude also altered by the reference beam including the unique amplitude changes of every other prior amplitude change the reference beam already had from other waves.

[@GK1belfer]

Congratulations on the longest and deep comment regarding issues related to a film I made over 45 years ago! It gives me great satisfaction that people from my grandchildren's generation, and even younger, are still interested in optical holography, which I presented in this film as best I could. Many thanks again!

[@ThomasGrillo]

Thanks for sharing this holography film.

[@divilator5332]

Interesting video , thanks for share.

[@johnpurefeeling6258]

I wonder if our two different night skies are created via holographic interferometry. That would be amazing.

[@TheSecondLaughingSoldier]

Apparently, holograms look red Iike 43 years ago.

[@samborghese3536]

when was this made

[@GK1belfer]

BorCrazy „Only” 39 years ago...

[@AstroAri504]

So when Missy Elliott said "flip it and reverse it" she was talking about physics??? 🤣🤣

[@mrmcgreg]

Is Holography dead?

[@GK1belfer]

Grigoriy Vdovin Это видео показывает единственную голографию того времени. Возможно, мода вернется к этому, как, например, на виниловыe пластинки.

[@GK1belfer]

Grigoriy Vdovin This video shows the only optical holography present that time. Perhaps the fashion will come back to it like eg. to vinyl records.

[@MrSirFluffy]

No, it's just we are just now barely getting to the level of technology that makes this field useful. It was very hard to make holograms before, since you need a pretty expensive setup. That laser table setup you see in the video is far beyond what most people can reasonably afford. Optics equipment is very expensive. It's getting more and more approachable every year that passes.

[@georgiion1684]

Some of the most modern methods of microscopy nowadays, that break the diffraction limit, are based on holography. Not anywhere near dead imo