Interference spectroscopy with advanced comb sources

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Optical frequency combs are lasers that produce very short and stable light pulses. By providing a precise and simple link between optical and electrically measurable frequencies they ignited in 2000 a revolution in frequency metrology, the science of measuring oscillations and time. Time keeping is important because most measurement units are directly linked to time, as this is the physical quantity that we humans can measure most precisely. Hence, when you buy a volume of gas for your car or when you pay your utility bill, you rely on the international time standard maintained by national laboratories. More direct applications of a precise time standard include geo-localization using GPS-like systems and synchronizing all financial transactions on a global scale.