Shooting requirements of holography

1, the holographic system should be stable. Because the interference fringes on the holographic negative are thin and dense, the smallest interference will cause the blurring of the interference fringes during photography. Therefore, the holographic system requires shockproof, sound wave interference prevention and temperature change prevention.

2. The light source must be coherent. Holography is based on the interference principle of light, so the light source must have good coherence. Laser light source has good spatial coherence and time coherence, and can obtain good holograms.

3. The optical path difference between the object light and the reference light should be as small as possible. The optical paths of the two beams of light should be equal, which should not exceed 2cm at most, and the amount of rope used to adjust the optical paths should be good; The included angle between the two beams should be between 30 and 60, preferably around 45.

4. Holographic film has high resolution. Thin and dense interference fringes are recorded on the holographic negative, so high-resolution photosensitive materials are needed. The general resolution is 3000 lines per millimeter, which can meet the requirements of holography.

Extended data:

Holographic photography technology

1. Holography is a photographic method that can record and reproduce three-dimensional (stereoscopic) images of objects without lenses. It is a technology that can record the amplitude and phase information of light wave front from objects and reproduce this light wave when necessary.

2. Due to the mutual interference between the object light and the reference light on the holographic negative, a very complex and fine interference fringe pattern is formed. These interference fringes record the amplitude and phase information of object light changing with its contrast and position.

3. Holographic negatives become holograms after conventional development and fixation. The appearance of hologram seems to have nothing to do with the appearance of the original object, but it records all the information of the object light in the form of optical coding.

Baidu encyclopedia-holographic photography