Has anyone ever heard or seen work on a 3D projection display using multiple steered lasers to stimulate light emission within a clear block of glass, plastic, transparent tank of liquid, etc?
This would use several moderately-powerful lasers with X/Y/Z steerable beams. All beams would be calculated to converge on a single point in space on a fluorescent transparent material, and cause sufficient focused stimulation for light to be emitted at that spot.
Each beam would be low-powered by itself, using an ultraviolet, infrared, or microwave laser source, so that an individual beam would not stimulate light emission within the transparent block, and so would be invisible passing through the block except where all the beams converge and cause light emission.
This would theoretically be capable of full-3D transparent shapes and outlines with depth perception, and be directly 3D-viewable without the need for polarization goggles.
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The primarily limitation is that this would need highly precise alignment between beam movements so that they all move in sync to hit the same spots in space at exactly the right moment.
Mirror galvanometers have mass and so have an inertial speed limit based on the torque of the drive servo and the mass of the rotor and mirror assembly. Really good galvanometers can be hundreds of dollars each, and a project like this would need at least 3 galvanometers per beam.
Meanwhile in order to stimulate a single point to illuminate -- and without leaving a faint illuminated trail from each beam -- may require 3-10 different steerable beams all coverging on the same points in space around the display area..
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This is also generally how targeted cancer treatment is done in hospitals, using an array of low-power radiation emission beams to target a single spot within a patient's body, to deliver a high radiation dose to a single spot in 3D space.
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