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when an electron drops from a higher energy state to a lower it emits a fixed frequency photon

Gallium Arsenic Silicon Carbon have bright lines in a band of infrared can be varied colors depending on proportions

this is monochromatic IR

if you put parallel mirrors on either side of the the activated atoms you get a laser

co2 gas laser ... Led Solid laser

although IR is produced by burning sugar in a body and digital cameras can see that too

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14y ago

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