The repetition rate and carrier-envelope phase offset frequencies of a turnkey, all-fiber-based continuum generator were phase locked to a hydrogen maser. The frequency of the hydrogen maser was calibrated with a highly stable cesium atomic clock, and therefore a fully phase-locked optical frequency comb with well-defined absolute frequencies was obtained. In contrast with the commonly used Ti:sapphire-laser-based systems, we have accomplished a fully turnkey system with no user-adjustable parts. To evaluate the performance of this novel system, we performed absolute frequency measurements in the telecommunications region and at 1064 nm and compared them with our traditional Ti:sapphire-based comb.
"The next generation of frequency combs will need to make the transition from laboratory instruments to field-usable systems. Erbiumdoped fiber (EDF) laser based frequency combs have been shown to have comparable performance to Ti:sapphire combs  while providing significant advantages in terms of portability and affordability. Phase-stabilized fiber combs typically have repetition frequencies (f rep ) between 100 and 250 MHz  . "
[Show abstract][Hide abstract] ABSTRACT: The frequency comb generated by a high repetition frequency erbium-doped fiber ring laser using carbon nanotube saturable absorber is phase-stabilized for the first time. The comb's stability is compared a photonic crystal fiber acetylene reference.
Lasers and Electro-Optics, 2009 and 2009 Conference on Quantum electronics and Laser Science Conference. CLEO/QELS 2009. Conference on; 07/2009
"LTRASHORT lasers of high repetition rates up to tens of gigahertz are of advantage to high-capacity telecommunication systems, and also are attractive for metrological and spectroscopic applications , . Passively mode-locked all-solid lasers are typically limited to a few hundred megahertz by the laser cavity lengths, and higher repetition rate requires shorter cavity length. "
[Show abstract][Hide abstract] ABSTRACT: We experimentally demonstrated a sub-picosecond laser based on Yb:Gd<sub>2</sub>SiO<sub>5</sub> crystal and obtained stable rational harmonic mode-locked laser output. Along with the fundamental repetition rate of 100 MHz, we observed the generation of the 200 MHz harmonics and pulse bunches, depending on the balance between the laser gain and incident pulse energy fluence on the semiconductor saturable absorber mirror. The pulse duration in harmonic mode-locking operation was measured as 600 fs, while pulses in bunch were measured with a duration of 1 ps separated by 20-ps time interval.
"Due to their excellent long-term operation, compactness and environmental stability fiber-based frequency comb lasers  are currently seen as an excellent alternative to Ti:sapphire based frequency combs for several applications. Especially as air-and space borne applications in frequency metrology are being developed, completely integrated, low noise, self-referenced frequency comb lasers operating at high repetition rate with low power consumption are required. "
[Show abstract][Hide abstract] ABSTRACT: An optically integrated frequency-comb-system based on a passively-mode locked, f<sub>CEO</sub>-locked Er:soft-glass-fiber-laser and a PPLN-waveguide phase-sensor is demonstrated. The oscillator emits pulses with 61 nm spectral bandwidth and 170 MHz repetition frequency.
Lasers and Electro-Optics, 2006 and 2006 Quantum Electronics and Laser Science Conference. CLEO/QELS 2006. Conference on; 06/2006
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