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astronomy laser entertainment system

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The limitations determined by the laws of photonics -- nature dictates that we can't get something for nothing -- is that you can't have both a small beam diameter and small beam divergence at the same time. It's a trade-off. We know that high powered laser has a beam diameter of 1.6mm at aperture and beam divergence of 1.0mRad. The specs for red laser are 0.8mm and 1.5mRad respectively.