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We study the carrier-envelope phase noise of an Er:fiber frequency comb which is passively phase-locked at the full repetition rate of 100 MHz. A novel characterization method determines an out-of-loop phase jitter of only 250 mrad when integrated over 12 orders of magnitude: from 50 μHz up to the Nyquist frequency.
Applications of optical frequency combs in high precision metrology [1] require low-noise stabilization of its carrier-envelope offset (CEO) frequency. This task is commonly achieved via active feedback. Fully passive elimination of the CEO frequency based on difference frequency generation (DFG) between two octave-separated comb sections followed by amplification of the DFG signal in the EDFA has...
An offset-free frequency comb generated by difference frequency mixing is established and characterized. mHz-level direct locking of the repetition rate to 85Rb and reference-limited linewidth narrowing via an extra-cavity electro-optic modulator are demonstrated.
Modern precision metrology ever more strongly relies on the availability of optical frequency combs. We review our approach to passive stabilization of the carrier envelope phase (CEP) of a pulse train at full repetition rate via difference frequency generation. Using this approach, we demonstrate a inherently offset-free Er:fiber comb directly locked onto an optical reference (85Rb) together with...
The generation of ultrafast optical pulses that are used for many applications is increasingly based on Er:fiber lasers. The inherent advantages of this technology are compactness, stability, and turn-key operation. Tm- and Yb-doped fiber systems are promising candidates for reaching microjoule pulse energies [1,2,3].
Synchronous high-power Yb: and Tm:amplifiers both coherently seeded by the same broadband passively phase stable Er:fiber system are demonstrated. Microjoule-level pulse energy and sub-200-fs operation at a repetition rate of 10 MHz are obtained.
Broadband seeding of a femtosecond Tm:fiber amplifier based on passively phase-locked Er:fiber technology is demonstrated. Excellent coherence properties of the seed are observed experimentally and analyzed theoretically.
The generation of phase-locked pulses with a well-defined electric field is essential for applications like high harmonic pulse generation [1] or precision metrology [2]. Active and passive locking schemes have been widely demonstrated utilizing Ti:sapphire technology. However, active stabilization requires cumbersome feedback loops and a locking of fCEO = 0 is very challenging at the full repetition...
We demonstrate a passively phase-locked seed source for fs-Er:fiber technology with CEO-frequency set to zero. The broadband output is reamplified and phaselocking is monitored by means of an f-2f interferometer.
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