The vibrations cause the fluid to move only at the surface where the resin is. Obviously the resin can not be at the bottom since there will be no way to raise the level of the resin. However what about having three layers of fluid? Salt water would be on the bottom as before, resin in the middle and some liquid lighter than water at the top. A tube could have one end at the bottom of the container to directly inject salt water without disturbing the middle and bottom layers, and so that way everything would work as normal. Of course this lighter than water liquid would need to not mix or react with the resin and it must be totally transparent to the laser.

I tried mixing soap (bottom layer), dyed blue water (middle layer) and olive oil (top layer) to try it out and it definitely stops the middle layer from shaking unless the glass is really vibrated hard (like slapping my hand hard against the table right next to it). Here is a hardcore version of several layers: http://img.wonderhowto.com/img/origi...8232920665.jpg

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