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Phase-locked two-branch erbium-doped fiber laser system for long-term precision measurements of optical frequencies

2004; Optica Publishing Group; Volume: 12; Issue: 24 Linguagem: Inglês

10.1364/opex.12.005872

1094-4087

Florian Adler, Konstantinos Moutzouris, Alfred Leitenstorfer, H. Schnatz, B. Lipphardt, Gesine Grosche, F. Tauser,

Solid State Laser Technologies

We present a highly versatile approach to the application of femtosecond Er:fiber lasers in optical frequency metrology. Our concept relies on the implementation of two parallel amplifiers, seeded by a single master oscillator. With the comb spacing locked to a frequency of 100 MHz, we apply the output from the first amplifier to generate a feedback signal to achieve a simultaneous phase-lock for the comb offset frequency. The output of the independently configurable second amplifier enables precision frequency measurements in the visible and near-infrared. As a first application, we continuously measure the absolute frequency of a resonator-stabilized diode laser over a period of 88 hours.