Courses: P5, P47?
We have a number of different holograms available, some for direct white light viewing, some that require monochromatic light transmitted through from the back side.
Setup: For the transmission holograms, we generally use a red laser which needs to be expanded to cover the entire size of the film. I had good results by using our Melles Griot laser fitted with a spacial filter, and then putting that beam through a microscope eyepiece to expand it further. Shine that on the back of the hologram film and view from the front at a slight angle.
The spacial filter is very sensitive and will likely need some fine tuning to maximize the beam intensity.
This can also be done (apparently) using a slide projector and the orange slides we have, to produce a monochromatic light source.
