Optics Express · 2004 · 131 citations · 1 references
EngineeringElectrical EngineeringPhysicsOpticsOptoelectronicsPhotonicsFiber OpticsFrequency MetrologyLaser DiodesLaser PhysicsOptical FibersOptical MetrologyAbsolute FrequencyFeedbackFiber LasersFrequency CombsLasersOptical Frequency CombsOptical Frequency MetrologyOptical Frequency Standards
The study introduces a versatile method for applying femtosecond Er:fiber lasers to optical frequency metrology. The system uses two parallel amplifiers seeded by a single master oscillator, with the first amplifier providing a feedback signal to phase‑lock the comb offset at 100 MHz, while the second amplifier delivers the output for precision frequency measurements across visible and near‑infrared wavelengths. The approach was demonstrated by continuously measuring the absolute frequency of a resonator‑stabilized diode laser for 88 hours.
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.
1