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Laser Corona from expired matchhead

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Uploaded by on Nov 19, 2008

coherent light diffraction patterns from reflected laser light. The match head here is already burnt...

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News & Politics

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  • Why, if you get a 100 mW laser, you should never watch it directly. If you look at the diffracted light off this expired matchhead, you can see the bloom from the sensor (the six-pointed star), but also the interference fringe (the ringed nature of the aura) and even diffraction grain (single-pixel spots) - both indicative the reflected light is potentially damaging to the eyes. ALWAYS do these experiments through a webcam, with something solid blocking the direct view!!!

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