Introducing the Anti-laser, Absorbing Beams of Light - NYTimes.com: The incoming beam is split in two, and hits the medium from two sides. The photons bounce around between the mirrors and interfere with one another, eventually wiping themselves out in a flurry of electrons and heat.
The experimental device absorbed about 99.4 percent of the light. In theory, an anti-laser should be able to absorb 100 percent.
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