normal> Chapter 1 Â Â Holographic principle [4]
Normal > holographic technology is to introduce an appropriate coherent reference wave and object light wave interference to get an interference field, record the interference field and get a hologram, which not only records the amplitude information of the object light, but also the ordinary The phase information of lost photographic technology is also recorded.
Normal > Holography includes two processes of recording and reproduction.
1.1 Â Â Record principle
Normal > The record is the interference pattern between the light wave of the subject and the reference light wave . The pattern is developed to form a hologram . The best source for recording is a laser. The laser has a high degree of spatial and temporal coherence, a small beam divergence angle, and a high concentration of energy.
1.2 Reproducing principle
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The first item in the formula is only one constant, which is called the direct light wave or the zero-order light wave, and the second item has the object light wave information, which is called the original image light wave IO or +1 order diffraction wave, and the third term is The conjugate information of the object light wave is called conjugate lightwave IC or -1 diffraction light wave.
When the reproduction light is the reference light R(x,y), a virtual image of the object is obtained at the time of reproduction.
When the reproducing light is the conjugate light of the reference light R(x,y) At the time of reproduction, the reality of the object was obtained, that is, the reality. (To be continued)