The first approach is to use autocorrelators. These split an ultrashort pulse into two, and overlap the two pulses in a nonlinear medium that provides second-harmonic generation, allowing users to ...

If that sounds like a lot, imagine trying to follow it in two- to three-minute bursts on one of China’s wildly popular ultrashort video platforms. Perhaps unsurprisingly, the plot went viral in China ...

Ultrashort laser pulses can make molecules vibrate ... These pulses, compressed to nearly a single cycle of a light wave, are combined with phase-stable near-infrared pulses for detection.