Diffusers can be used to soften the shadows from the object beam for softer lighting effects. From a artistic lighting standpoint, a laser is considered a point source. To make softer lighting we need to widen the beam source.
There are many ways to do this:
- Broken Light Bulbs
- Sandblasted Glass
- Etched Glass
- Glass or Plastic sanded in one direction only
Commercial diffusers are also available. You can specify how much diffusion you need. A 10% diffuser allows most of the light to pass through. A 30% diffuser spreads more of the light.
It should be remembered the diffusers also randomize the polarization. This can increase the fog level of the hologram. It is very important the the diffuser be shielded from the plate so no stray light can hit the plate directly.