Characteristics of Holography and Its Essential Difference from General Photography

First, the characteristics of holographic photography

Holography is characterized by recording all the information (amplitude and phase) in the reflected or transmitted light waves of the photographed object. Holography not only records the intensity (amplitude) of the reflected light wave of the photographed object, but also records the phase of the reflected light wave. This can be achieved by superimposing the reference beam and the reflected beam on the photographic film to produce an interference pattern.

Second, the difference between holographic photography and ordinary photography

(a) The recorded information is different

1. Ordinary photography uses the principle of lens imaging to record the intensity of the reflected light on the surface of the object, that is, the amplitude information of the reflected light, on the photosensitive film/device.

2. Holography uses the principle of light interference to record all the light information, including amplitude and phase, in the light waves reflected or transmitted by the photographed object.

(B) the relationship between objects and images is different

1. In the ordinary photography process, there is a point-to-point correspondence between objects, that is, an object point corresponds to an image point in the image plane.

2. There is a point-to-point correspondence between objects and images in the holographic process, that is, the light beam emitted by each object point directly falls on the whole plane of the recording medium. Conversely, each part of the hologram contains the light information of every point of the object.

(3) Different images

1, ordinary photography is a two-dimensional plane image.

2. Holography to obtain three-dimensional images.

References:

Baidu Encyclopedia-Holography

Baidu encyclopedia-taking pictures (photography)