Realization of a Timescale TS From a Microwave and an Optical Clock (IMAGE)
Caption
The Cs clock transition frequency is compared against the maser flywheel frequency. The acquired offset Cs yH is used to correct the classical timescale TS(Cs) generated from the maser utilizing a phase stepper (Df). An equivalent scheme is applicable when referencing the timescale TS(Sr) to an optical frequency standard. For that purpose, the clock laser light is down-converted to the microwave regime using a femtosecond frequency comb (FC) before comparing against the flywheel. Moreover, both maser offsets can be analyzed to yield the Sr clock frequency in SI units.
Credit
christian.grebing@ptb.de
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