Introduction of holographic photos

After an object is illuminated by a light source, the light scattered from the surface of the object enters the eyes of the observer. If we can store this waveform somewhere, and then reassemble the previous waveforms, so that the waveforms enter the observer's eyes in the same shape, we can see the same image as the original, and the image we see at this time is as stereoscopic as the original. If we move our eyes at will, we can see different parts of the object. This is the basic principle of holography, originally called wavefront reconstruction. Here, in order to make a hologram, it is necessary to first irradiate the object with a laser beam, and then record the diffraction pattern (the area where the two beams intersect) generated by the reflection of the second laser beam and the first beam on the negative. When the negative is developed, it looks like a meaningless combination of aperture and stripe. But when the negative is irradiated by another laser beam, a three-dimensional image will appear on the negative (this is different from the so-called hologram in general printing, and only a narrow angle can see the three-dimensional image. The real hologram has no angle limit, and it must be seen by laser.