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  • frequency (freq) With reference to electromagnetic radiation, the number of crests of waves that pass a fixed point in a given unit of time, in light or other wave motion. Expressed in hertz or cycles per second.
  • mode-locked laser A laser that functions by inducing a fixed phase relationship between all of the modes present in the laser cavity. Once all modes are in phase, the modes are then said to be locked. The interference of these modes with one another inside the cavity...
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