Volume hologram, one of the most commonly and
widely used transmission hologram, is a hologram when the angle of
difference between object beam and reference beam is from 90 degrees to
180 degrees.
At 90 degrees the angle is great enough and fringe spacing becomes
small enough for us to say that the recording process is taking place
throughout the volume of thickness of the emulsion.
In a volume reflection hologram the reference beam makes an arc clear
around so that it hits the film from the opposite side as the modulated
object beam.
Volume hologram is recorded by two coherent beams in which one is
called signal beam and the other is call reference beam. If the
reconstruction beam used to probe the volume hologram is identical to
the original reference beam respected to the wavefront profile and
propagating direction, a strong diffraction is generated. The
diffraction propagates along the signal beam propagating direction and
preserves identical wavefront profile. In this case, the volume hologram
is called Bragg matched.
Advantages of volume holographic imaging systems:
- More design freedom
- Higher light efficiency
- Lower building cost
- Large storage capacity
- Parallelism of information readout
Applications of Volume Hologram
- Microelectronic packaging
- Food packaging
- Optic packaging
- Electrical packaging
- Isotopic labelling
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