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High harmonics

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A schematic of a new design for a laser that emits ultrashort pulses of light. Light waves of different frequencies (red and green) are combined to form a new wave (yellow), which in turn passes through a gas (blue). The light excites the atoms of the gas, which release their excess energy as light of an even higher frequency.

Movies of electrons

Lasers that emit pulses lasting a quintillionth of a second could characterize the behavior of individual electrons during chemical reactions.

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