You don't need a laser but a monochromatic point source. Modern LEDs work quite well.
Depth of reflection holograms depends on the quality of the reference beam. A divergent one gives limited depth but a parallel or convergent one would give much more. But this is much more difficult to achieve.
Depth of reflection holograms depends on the quality of the reference beam. A divergent one gives limited depth but a parallel or convergent one would give much more. But this is much more difficult to achieve.