Time for a better table.
While searching around for all the variations on home-made holography tables, I came across one that wasn't the usually sand, concrete, and/or steel. In A new design for a holographic table (1986 J. Phys. E: Sci. Instrum. 19 643), the authors describe a table constructed with layers of rubberized coir (coconut fiber coated with latex) and thin plywood sandwiched between two steel plates.
The part I find most intriguing is that it doesn't weigh a ton. The only heavy parts in the coir design are the steel plates themselves, (about 120 lbs each for 3/16" mild steel). Yet, the authors seem to claim reasonable vibration isolation, especially at the very low end, 2-4 Hz.
I cannot find rubberized coir in very small quantities, but I think I can get similar acoustic dampening from mineral wool board, something like Roxul Rockboard 60 or Owens Corning 705. I'd use cinder blocks for legs and build the table in the layers shown in the code block.
Does anyone think this may have some potential, or am I just wasting my time? Better still, has it been tried before?
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================================ 3/16" Steel plate
//////////////////////////////// 2" Rockboard
-------------------------------- 3/16" Masonite
//////////////////////////////// 2" Rockboard
-------------------------------- 3/16" Masonite
//////////////////////////////// 2" Rockboard
================================ 3/16" Steel plate