Tailored Design of Mode-Locking Dynamics for Low-Noise Frequency-Comb Generation

Şenel, Çağrı; Hamid, Ramiz; Erdogan, Cihangir; Çelik, Mehmet; İlday, F. Ömer

doi:10.1103/physrevapplied.10.024027

Cited by 5 publications

(3 citation statements)

References 31 publications

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“…This approach leads to the generation of ultrashort pulses (sub-100 fs) with broad-spectrum and high energy per pulse. 18,19 In our study, the dispersion-managing approach is adapted to a multimode fiber cavity with a similar motivation, to generate intracavity short pulses with high peak powers sufficient to trigger strong spatiotemporal interactions in order to effect spatial beam clean-up. The proposed cavity is illustrated in Fig.…”

Section: Numerical Studiesmentioning

confidence: 99%

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Single-mode output by controlling the spatiotemporal nonlinearities in mode-locked femtosecond multimode fiber lasers

et al. 2020

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The performance of fiber mode-locked lasers is limited due to the high nonlinearity induced by the spatial confinement of the single-mode fiber core. To massively increase the pulse energy of the femtosecond pulses, amplification is performed outside the oscillator. Recently, spatiotemporal mode-locking has been proposed as a new path to fiber lasers. However, the beam quality was highly multimode, and the calculated threshold pulse energy (>100 nJ) for nonlinear beam self-cleaning was challenging to realize. We present an approach to reach high energy per pulse directly in the mode-locked multimode fiber oscillator with a near single-mode output beam. Our approach relies on spatial beam self-cleaning via the nonlinear Kerr effect, and we demonstrate a multimode fiber oscillator with M 2 < 1.13 beam profile, up to 24 nJ energy, and sub-100 fs compressed duration. Nonlinear beam self-cleaning is verified both numerically and experimentally for the first time in a mode-locked multimode laser cavity. The reported approach is further power scalable with larger core sized fibers up to a certain level of modal dispersion and could benefit applications that require high-power ultrashort lasers with commercially available optical fibers.

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Section: Numerical Studiesmentioning

confidence: 99%

“…Inside a dispersion-managed cavity, the pulse stretches and compresses significantly every round trip while having a near zero net-cavity group-velocity dispersion (GVD). This approach leads to the generation of ultrashort pulses (sub-100 fs) with broad-spectrum and high energy per pulse [16,17].…”

Section: Numerical Studiesmentioning

confidence: 99%

Single-mode output by controlling the spatiotemporal nonlinearities in mode-locked femtosecond multimode fiber lasers

et al. 2020

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“…These astounding discoveries and accomplishments are the consequence of combining high temporal coherence with precise resolution by using frequency comb sources in addition to customizing laser beams 21 . Nonetheless, while the quantum control of single-qubit nuclear spins and atomic hyperfine ground states is possible 22 , strong transitions control is limited by the availability of sub-nanosecond laser waveforms 23 .…”

Section: Introductionmentioning

confidence: 99%

Analysis of a q-deformed hyperbolic short laser pulse in a multi-level atomic system

Boutabba

Grira

Eleuch

2022

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A fast laser pulse with a q-deformed hyperbolic function shape is investigated in a Multi-level atomic system. Therefore, we first derive the exact solution of the Bloch equations describing a two-level atom excited by a q-deformed laser pulse with dephasing and time-dependent detuning. Next, we analyze the dynamic of the atomic population inversion at resonance and off-resonance of a Rubidium 87 three-level atom driven by a classical weak field and a strong q-deformed control laser. Finally, in order to get a deeper insight of the probe field’s absorption and dispersion properties, we investigate the coherence’s dependence on the q-deformation. Our work demonstrates that, the dynamic of the atomic system can be fully controlled through the manipulation of the asymmetry scaling parameter q of the q-deformed hyperbolic laser wave-form.

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Analogy of harmonic modelocked pulses to trapped Brownian particles improves laser performance

et al. 2023

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High repetition rate ultrafast lasers are needed for diverse applications. Harmonic modelocking, where multiple identical, equidistant pulses circulate in the cavity, reaches beyond the practical limitations of reducing the cavity length. However, it suffers from stochastic deviations that manifest as supermodes in the radio-frequency spectrum and difficulties in maintaining the same harmonic state, often coupled with tradeoffs in pulse energy, duration, or noise performance. Here, we first show that deviations in the temporal positions of the pulses contribute disproportionately more to the supermodes than deviations in their amplitudes. Then, we argue that these fluctuations are analogous to those of trapped Brownian particles. The analogy reveals that supermodes are suppressed by stronger spectral filtering, which corresponds to fluid viscosity, and higher pulse energy reduces the noise, akin to Brownian particle analogy improves harmonic modelocking lower temperature. Guided by this intuitive picture, we construct a Ybfibre laser incorporating strong filtering and high intracavity energies by limiting nonlinear polarisation evolution to a short section of ordinary fibre. The rest of the all-fibre cavity comprises polarisation-maintaining fibre, which additionally improves environmental robustness. We report record-high supermode suppression ratios, reaching 80 dB, excellent longterm and environmental stability, and pulse energy, duration, and noise characteristics that are similar to fundamentally modelocked lasers.

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Tailored Design of Mode-Locking Dynamics for Low-Noise Frequency-Comb Generation

Cited by 5 publications

References 31 publications

Single-mode output by controlling the spatiotemporal nonlinearities in mode-locked femtosecond multimode fiber lasers

Single-mode output by controlling the spatiotemporal nonlinearities in mode-locked femtosecond multimode fiber lasers

Analysis of a q-deformed hyperbolic short laser pulse in a multi-level atomic system

Analogy of harmonic modelocked pulses to trapped Brownian particles improves laser performance

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