A new ultrafast laser emits pulses of light 30 billion times a second

The devices pulsate at a higher rate than ever before, thanks to a novel technique

frequency comb made of discrete colors of light

FINE-TOOTH COMB An ultrafast laser pulsates faster than any of its predecessors. The new device isolates light of particular frequencies (peaks in blue curves) to create a frequency comb made up of discrete colors of light (vertical bands). Scientists had to eliminate jitter in their experiment to make the comb (progression left to right).

D. Carlson/NIST

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