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" ... So, you get a broad-band pulsed laser, do some clever tricks to manipulate the exact mix of frequencies included in the pulse, and you can make a laser flash on for a few femtoseconds at a time. Then you can use this to do a sort of stroboscopic movie: zap something with a bright pulse to set the start time, then send in a second pulse a few femtoseconds later (if you can make these pulses at all, you can split them up and delay one part by a tiny amount) to see how things have changed. Repeat that over and over, and you can make a "movie." ... "