What are the basic conditions for shooting high-quality holograms?

In order to realize holography, the experimental device must meet the following three basic conditions:?

(1) A good coherent light source, that is, the reference beam and the object beam must be coherent light (so laser is needed as a photographic light source, and the object beam is generally equivalent to the reference beam).

(2) A stable anti-vibration platform, that is, the optical system must have sufficient mechanical stability.

(3) High-resolution photographic film.

(4) Understand and use related photography such as developing, fixing and developing.

Holographic photos are different from ordinary popular science photos. Under proper illumination, the scene displayed on the hologram is three-dimensional, and all sides of the scene can be seen.

The difference between holographic photography and conventional photography is that conventional photography only records the light intensity change on the surface of the object being photographed, that is, only records the amplitude of light; Holography records all the information of light waves, not only the amplitude, but also the phase of light waves. In this way, all the information of the optical wave field of the space object is stored and recorded. Then, the original space scene is revealed by the diffraction of monochromatic illumination light with specific wavelength by hologram. It can "revive" a frozen scene and show it to people.

Ordinary photography can only store the spatial distribution of the light intensity of the object being photographed, which can not meet the requirements of people who want to perceive the real 3D scene in a specific environment. Holography is called "holography" because it records the interference fringes between the object light wave and the corresponding reference light wave, thus recording all the light field information including the amplitude (light intensity) and phase of the object.