Two-Photon Absorption Experiment (IMAGE)

University of California - Berkeley

Two-Photon Absorption Experiment

Caption

A beam of hot barium atoms exits an oven and passes through a collimator before hitting overlapping laser beams. If photons sometimes act like fermions, every once in a while a barium atom would absorb two photons and subsequently emit a flash of light. No significant events were observed.

Credit

Damon English/UC Berkeley

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