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Dive into the research topics where C. Chedot is active.

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Featured researches published by C. Chedot.


Optics Express | 2006

Generation of parabolic bound pulses from a Yb-fiber laser

Bülend Ortaç; Ammar Hideur; M. Brunel; C. Chedot; Jens Limpert; Andreas Tünnermann; F. Ö. Ilday

We report the observation of self-similar propagation of bound-state pulses in an ytterbium-doped double-clad fiber laser. A bound state of two positively chirped parabolic pulses with 5.4 ps duration separated by 14.9 ps is obtained, with 1.7 nJ of energy per pulse. These pulses are extra-cavity compressed to 100 fs. For higher pumping power and a different setting of the intra-cavity polarization controllers, the laser generates a bound state of three chirped parabolic pulses with different time separations and more than 1.5 nJ energy per pulse. Perturbation of this bound state by decreasing pump power results in the generation of a single pulse and a two-pulse bound state both structures traveling at the same velocity along the cavity. A possible explanation of the zero relative speed by a particular phase relation of the bound states is discussed.


Optics Letters | 2007

High-power all-normal-dispersion femtosecond pulse generation from a Yb-doped large-mode-area microstructure fiber laser.

Caroline Lecaplain; C. Chedot; Ammar Hideur; Biilend Ortac; Jens Limpert

We report on an all-normal-dispersion mode-locked fiber laser based on a large-mode-area Yb-doped microstructure fiber and using a high nonlinear modulation depth semiconductor saturable absorber mirror. The laser delivers 3.3 W of average output power with positively chirped 5.5 ps pulses at a center wavelength of 1033 nm. The pulse repetition rate is 46.4 MHz, which results in an energy per pulse of 71 nJ. These pulses are extracavity dechirped down to 516 fs by using bulk gratings. The average power of the dechirped pulses is 2.3 W, which corresponds to a peak power of more than 96 kW.


Optics Letters | 2007

On the possibility of observing bound soliton pairs in a wave-breaking-free mode-locked fiber laser

G. Martel; C. Chedot; V. Reglier; Ammar Hideur; Bülend Ortaç; Philippe Grelu

On the basis of numerical simulations, we explain the formation of the stable bound soliton pairs that were experimentally reported in a high-power mode-locked ytterbium fiber laser [Opt. Express 14, 6075 (2006)], in a regime where wave-breaking-free operation is expected. A fully vectorial model allows one to rigorously reproduce the nonmonotonic nature for the nonlinear polarization effect that generally limits the power scalability of a single-pulse self-similar regime. Simulations show that a self-similar regime is not fully obtained, although positive linear chirps and parabolic spectra are always reported. As a consequence, nonvanishing pulse tails allow distant stable binding of highly-chirped pulses.


Fiber and Integrated Optics | 2008

Numerical Maps for Fiber Lasers Mode Locked with Nonlinear Polarization Evolution: Comparison with Semi-Analytical Models

G. Martel; C. Chedot; Ammar Hideur; Ph. Grelu

Abstract We have used a fully vectorial model based on two coupled nonlinear Schrödinger equations to study mode locking and pulse generation initiated and stabilized by nonlinear polarization evolution in a stretched pulse, double-clad, Yb-doped, fiber laser. The model takes explicitly into account gain saturation, finite amplification bandwidth, Kerr-induced self- and cross-phase modulations, group velocity dispersion, polarization control, and linear birefringence. Complete maps versus the orientation of intra-cavity wave-plates have been established. They comprise a large variety of pulse regimes that can be simply obtained by turning the intracavity wave-plate: stable single pulse per round trip, multiple pulsing, unstable pulsing on a continuous wave (CW) background, as well as limit cycles. In addition, we have demonstrated that linear birefringence plays a key role in the pulse-shaping mechanism induced by nonlinear polarization evolution.


Fiber and Integrated Optics | 2008

Mode-Locked Ytterbium-Doped Fiber Lasers: New Perspectives

C. Chedot; Caroline Lecaplain; Saïd Idlahcen; G. Martel; Ammar Hideur

Abstract In this article, we discuss recent advances in ultra-short pulse generation with ytterbium-doped fiber lasers. We discuss the fundamental properties and technical challenges of mode-locked single-mode fiber lasers operating in the 1-μm range, and the methods to achieve high peak-powers. We demonstrate a high-power passively mode-locked fiber laser based on a photonic crystal fiber featuring large-mode-core and short absorption length that greatly exceed the power limitation of single-mode fiber oscillators. Multi-watts average powers in sub-picosecond pulses are obtained. This open new avenue to new performance levels of ultra-short pulse solid-state lasers.


Proceedings of SPIE, the International Society for Optical Engineering | 2008

Mode-locked Yb-doped large-mode-area microstructure fiber laser

Caroline Lecaplain; Ammar Hideur; C. Chedot; G. Martel; Bülend Ortaç; Jens Limpert

We report on an all-normal dispersion passively mode-locked fiber laser based on an ytterbium-doped largemode- area microstructure fiber and featuring high-energy ultra-short pulses. Mode-locking was achieved with a high modulation depth semiconductor saturable absorber mirror (SESAM). We investigate the influence of the modulation depth of the SESAM on the laser performances. We show that mode-locking could be achieved with a modulation of only 10 %. However, the best performances in term of pulse energy are obtained with the highest modulation depth (35 %). In this case, the laser delivers 3.3 W average output power with positively-chirped 5.5 ps pulses at a center wavelength of 1033 nm. The pulse repetition rate is 46.4 MHz, which results in an energy per pulse of 71 nJ. These pulses are extra-cavity de-chirped down to 516 fs using bulk gratings. The average power of the de-chirped pulses is 2.3 W, which corresponds to a peak power of more than 96 kW.


Proceedings of SPIE | 2008

High-average power femtosecond pulse generation from a Yb-doped large-mode-area microstructure fiber laser

Caroline Lecaplain; C. Chedot; Ammar Hideur; Bülend Ortaç; Jens Limpert

We report on a all-normal dispersion mode-locked fiber laser based on a large-mode-area ytterbium-doped microstructure fiber and using a high nonlinear modulation depth semiconductor saturable absorber mirror (SESAM). The laser delivers 3.3 W average output power with positively-chirped 5.5 ps pulses at a center wavelength of 1033 nm. The pulse repetition rate is 46.4 MHz, which results in an energy per pulse of 71 nJ. These pulses are extra-cavity de-chirped down to 516 fs using bulk gratings. The average power of the de-chirped pulses is 2.3 W, which corresponds to a peak power of more than 96 kW.


Proceedings of SPIE | 2006

Self-similar low-noise femtosecond ytterbium-doped double-clad fiber laser

Bülend Ortaç; Ammar Hideur; C. Chedot; M. Brunel; G. Martel; Jens Limpert

We report on the generation of self-similar highly-stable femtosecond pulses from a side-pumped ytterbium-doped double-clad fiber laser. Positively-chirped parabolic pulses with 6.4 ps duration and more than 3.2 nJ energy are obtained. These pulses are extra-cavity compressed to 140 fs. The noise measurements using radio-frequency analysis show that this regime of emission ensures low-noise operation with less than 0.05 % amplitude fluctuations.


Advanced Solid-State Photonics (2008), paper WB17 | 2008

High-Power Femtosecond Pulse Generation from a Yb-Doped Large-Mode-Area Microstructure Fiber Laser

Caroline Lecaplain; C. Chedot; Ammar Hideur; Bülend Ortaç; Jens Limpert

We report on a passively mode-locked laser based on a large-mode-area ytterbium-doped microstructure fiber. The laser delivers 3.3 W of average power at 46 MHz repetition rate. These pulses are extra-cavity dechirped to 516 fs.


international quantum electronics conference | 2007

Highly-chirped similaritons generation from a mode-locked fiber laser

C. Chedot; G. Martel; Ammar Hideur; Ph. Grelu

In this communication, we report experimental and numerical results on dynamics and propagation of self-similar pulses in a passively mode-locked ytterbium doped DC fiber laser.

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Ph. Grelu

University of Burgundy

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