A
plane hologram is a hologram when the angle difference between the
object beam and reference beam is less than 90 degrees. Plane means that
the holographic information is primarily contained in the
two-dimensional plane of the emulsion. Plane hologram is a type of
transmission hologram.
Plane holograms are also called thin holograms which requires coherent
or highly filtered playback source. The emulsion have a thickness of
around seven microns or 7/millionths of a meter. The spacing between
fringes is large enough, when the angle is under 90 degrees, for us to
imagine that the depth of the emulsion isn't really being utilized in
the recording of the hologram.
The image plane can be set in a way that the object seems to be
optically suspending in front of the hologram, or just a part of it in
front of the hologram and another part behind it, or that everything is
suspending in the back. In a plane transmission hologram the reference
beam is hitting the film from the same side as the object beam. It has a
relatively uniform fringe pattern.
Plane hologram is widely used in electronic packaging.
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