The similarities and differences between digital holography and optical holography

The similarities and differences between digital holography and optical holography are as follows:

1. Recording process: The recording process of both is similar, both are carried out through the interference pattern of the object light wave and the reference wave Recording, but digital holograms are recorded through a digital camera and the hologram is stored in a computer, while optical holograms are recorded through a holographic dry plate.

2. Imaging speed: Optical holographic imaging is faster, while digital holographic imaging is slower.

3. Production cost: The production cost of digital holography is low, while the production cost of optical holography is high.

4. Application flexibility: Digital holography adopts digital recording and image display technology, which avoids the tedious physical and chemical processing of optical holography, so it has higher application flexibility.

5. Image reconstruction: Digital holography and optical holography are similar in the recording optical path, both require the existence of actual objects, but digital holography uses digital technology to reconstruct images, while optical holography uses optical diffraction. To realize the value of the recorded object field.

6. Image reproduction: Both optical holograms and computational holograms can use optical methods to reproduce object light waves, but there are essential differences in their production methods.

In general, digital holography and optical holography are different in the way they are recorded and reproduced, but they are similar in principle. Both are performed through the interference pattern of the object light wave and the reference wave. Record and reproduce.