You can hear femtosecond lasers because they ionize the air, creating a spark. T... | Hacker News

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		mitthrowaway2 8 months ago \| parent \| context \| favorite \| on: ZEUS – A new two-petawatt laser facility at the Un... You can hear femtosecond lasers because they ionize the air, creating a spark. They buzz at the pulse repetition frequency.

hinkley 8 months ago [–]

Do you know how often this one pulses? I was getting the impression it fires once per hour given the power levels.

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