Holography is a physical phenomenon in wave optics. As the name implies, you need optics, lenses, mirrors, and mounts to direct the laser beam into its ordered orbits so that the hologram or object can be picked up at a certain angle.
Now the holography follows only its own regularity, therefore here applies:
Mirror is not the same mirror. A handbag mirror or a shaving mirror is completely unsuitable for holography, since the mirror coating is behind a glass plate. So if you wanted to redirect a laser beam by means of such a mirror, the beam would break even on the front glass plate of the mirror and would be counterproductive for the success of a hologram.
In holography, only so-called “surface mirrors” can be used, that is to say, mirrors whose mirroring is vapor-deposited directly on the front of the glass body and which thereby steers the laser beam in the desired direction without deflection.
In addition to the plane mirrors used in advanced holography and more or less large concave mirrors that direct the expanded laser beam in the direction of film or object. These large plane mirrors are of excellent optical quality and generate good results.
I use concave mirrors between 0.8 and 35 cm for the production of my holograms.
Lenses and (microscope) lenses are also essential for the structure to accommodate a hologram type such as small pinholes, so-called “pinholes”.
All optical elements should have the same construction height so that the laser beam can maintain its horizontal spread.
An important element is glass plates to fix the holographic film between them, unless one uses holographically coated glass plates, but which are many times more expensive and less flexible to handle.
