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Schlagwörter:
LOCKED FEMTOSECOND-LASER; TRANSITION; STANDARDOptics; Physics;
Zusammenfassung:
We demonstrate a method to determine the absolute mode number of a frequency comb when it is used for high-precision laser frequency measurement, without the help of wavemeters. Our technique involves changing the repetition rate of the frequency comb in a two-step process. Guidelines for choosing the correct repetition rates for different laser linewidths are given. As a demonstration, the absolute frequencies of two lasers with different linewidths are measured with our method.