From "Electron Micrographs of Hologram Cross-sections" Motoo Akagi, Tadao Kaneko, Tsutomu Ishiba. Applied Physics Letters, Vol 21, No. 3, 1 August 1972.
The photos below were made with Transmission Electron Microscopy.
20u wide photo of an amplitude hologram in Kodak 649F Film.
Same sample zoomed into 5u wide.
Phase hologram in Kodak 649F about 25u wide.
Phase Hologram in Scientia 14C75 film about 25u wide.
Same sample zoomed in to 5u wide.
Cross section of an amplitude hologram on Kodak 649F about 30u wide.