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A frequence comb is simply a peculiar benignant of laser airy whose spectrum, oregon acceptable of frequencies, resembles the teeth of a comb. Instead of containing conscionable 1 colour (one frequency), it emits a ample fig of evenly spaced frequencies. The spacing is highly regular.
One mode to marque a frequence comb is utilizing a mode-locked laser that emits precise abbreviated pulses of light, repeating again and again astatine a dependable rate.
A frequence comb is utile due to the fact that it lets scientists comparison an chartless airy frequence to a unchangeable notation with bonzer precision. Say you person immoderate enigma light, e.g. airy produced by a caller laser that you person built, and you request to find retired its nonstop frequency. You tin radiance the caller laser airy and airy from a frequence comb connected a communal airy sensor.
The sensor volition nutrient an electrical signal. If 1 comb bony is precise adjacent successful colour to your chartless laser, the 2 airy waves don’t enactment up perfectly. Sometimes their peaks enactment up, truthful the sensor awesome gets stronger; sometimes they don’t and the awesome gets weaker. You tin frankincense fig retired what colour your laser is producing by combining the frequence (or tooth) it’s closest to with however overmuch it is disconnected by. The sensor awesome volition uncover some these details.
Frequency combs are an important modern instrumentality to calibrate atomic clocks and measurement shifts successful airy caused by gravity, among assorted different applications.
