What is the difference between transmission and reflection holograms in more detail?

 Transmission and reflection holograms are two types of holograms that differ in how they record and replay light waves ¹.

Transmission holograms record and replay light waves that pass through the hologram, requiring monochromatic light for viewing ¹. When monochromatic light passes through a transmission hologram, it creates a 3D image ². The fringes in transmission holograms are usually spaced more than 1/2 wavelength apart ³.

Reflection holograms record and replay light waves that bounce off the surface of the hologram, enabling viewing under white light ¹. When laser light or white light reflects off of the surface of a reflection hologram, it creates a 3D image ². The fringes in reflection holograms lie in planes that are parallel to the holographic plate and are only about 1/2 wavelength apart ³.

Both types of holograms create 3D images, but with different viewing conditions ¹.