Necessary Optics:

Each set up should include:

2 mirrors - one of which is on a linear translator for final adjustment of arm length
1 beam splitter
1 laser source -- I use HeNe, argon ion laser, and dye laser but a diode laser as a second source with a HeNe would also work.
Ruler and Meter stick
Lighter
Piece of thick glass and holder with angular adjustment
Screens