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Introduction to Holography - 1972
Here's a 40 year old film that details the basic concepts of holography:
https://www.youtube.com/watch?v=tjWznlGst9M
It includes a close-up of an ancient HeNe (what the heck did they glue the Brewster windows to the tube with???), the demonstration of a hologram fragment's capability to reconstruct the entire original image, a circular hologram, and other neat stuff.
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That's Jung Teong (TJ) doing the demo, using the Gaertner holography kit equipment and a Holosonics He-Ne laser. It was probably Torrseal they used on the Brewster windows.
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