I cut holes in the floor so that the cinder blocks could rest right on the concrete floor.

As you can see the concrete floor was very uneven as shown in this photo in which the blocks were setting un mortarted in place.

The blocks are very level using mortar in between each layer of block to level them out.

Here is a side view of the table. It consists of blocks, plywood, carpet, inner tubes, carpet, plywood and finally a 3/8 inch thick sheet of steel.

Here is the final steel table top painted black.

The laser resides off the table and is directed to the table by transfer mirror M1 seen right in front of the laser.

After the beam hits the mirror M2 which is seen just to the right of the photo, it is directed and expanded through a spatial filter, then passes through a square aperture and up to mirror M3 for overhead lighting (M3 not seen yet).

This is a view from M2 looking down the path, through the spatial filter and into the feed aperture of the camera.

After the feed aperature the spread beam hits the overhead M3 mirror (on the right) and is reflected down to the plate holder.

Here is the plate holder holdeing a glass plate on the right. On the left is the transfer set up for image planing reflection holograms. When the transfer set up is used the top bar of the plate holder is raised out of the way and there is no glass or film in the plate holder.

This is the same view with the room light out.

This is looking through the plateholder.