High-energy temporally shaped nanosecond-pulse master-oscillator power amplifier based on ytterbium-doped single-mode microstructured flexible fiber

Lago, Laure; Bigourd, Damien; Mussot, Arnaud; Douay, M.; Hugonnot, Emmanuel

doi:10.1364/ol.36.000734

Cited by 27 publications

(15 citation statements)

References 12 publications

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“…Amplification of nanosecond pulses lies in between, targeting the highest energy per pulse. In the past decade and in the nanosecond regime, many research teams have developed YDFA delivering nanosecond pulses with pulse energy over 1 mJ [22][23][24] and even 25 mJ using Yb-doped large mode area fibers [25][26]. All those results were achieved by cascading multiple YDFA pumped by laser diodes centered at 976 nm and working at a repetition rate around 10 kHz.…”

Section: Introductionmentioning

confidence: 99%

Compact nanosecond laser system for the ignition of aeronautic combustion engines

Amiard-Hudebine

Tison

Freysz

2016

Journal of Applied Physics

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We have studied and developed a compact nanosecond laser system dedicated to the ignition of aeronautic combustion engines. This system is based on a nanosecond microchip laser delivering 6 μJ nanosecond pulses, which are amplified in two successive stages. The first stage is based on an Ytterbium doped fiber amplifier (YDFA) working in a quasi-continuous-wave (QCW) regime. Pumped at 1 kHz repetition rate, it delivers TEM00 and linearly polarized nanosecond pulses centered at 1064 nm with energies up to 350 μJ. These results are in very good agreement with the model we specially designed for a pulsed QCW pump regime. The second amplification stage is based on a compact Nd:YAG double-pass amplifier pumped by a 400 W peak power QCW diode centered at λ = 808 nm and coupled to a 800 μm core multimode fiber. At 10 Hz repetition rate, this system amplifies the pulse delivered by the YDFA up to 11 mJ while preserving its beam profile, polarization ratio, and pulse duration. Finally, we demonstrate that this compact nanosecond system can ignite an experimental combustion chamber.

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Section: Introductionmentioning

confidence: 99%

Compact nanosecond laser system for the ignition of aeronautic combustion engines

Amiard-Hudebine

Tison

Freysz

2016

Journal of Applied Physics

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“…The well-known phenomena of Stimulated-Brillouin-Scattering (SBS) takes place among the most deleterious limitations for the production of high energies [1][2][3][4] using all-fiber MasterOscillator-Power-Amplifiers (MOPA). They occur in the backward direction of propagation, thus leading to power transmission issues, severe pulse distortions and possibly catastrophic damage effects in the optical components.…”

Section: Introductionmentioning

confidence: 99%

“…Plus or minus efficient techniques may be used to cancel out or reduce SBS effects, using Large-Mode-Area fibers. A very common option is based on the use of active phase-modulation [5,6], to be selected for single-frequency operation [2,3]. Other options [7][8][9][10] either consist of specific fiber core-clad designs or of the application of thermomechanical constraints by external means, when fibers are long enough.…”

Section: Introductionmentioning

confidence: 99%

SBS management in Yb-fiber-amplifiers using multimode seeds and pulse-shaping

Jolly¹,

Gökhan²,

Bello³

et al. 2014

Opt. Express

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Abstract:We present a comprehensive analysis of the technique of Longitudinal-Mode-Filling (LMF) to reduce Stimulated Brillouin Scattering (SBS) limitations in Ytterbium Doped Fibre Amplifiers (YDFA), for the generation of nanosecond, temporally shaped pulses. A basic MasterOscillator-Power-Amplifier (MOPA) system, comprising an output YDFA with 10µm-core active fibre, is experienced for benchmarking purposes. Input pulse-shaping is operated thanks to direct current modulation in highly multimode laser-diode seeds, either based on the use of Distributed Feed-Back (DFB) or of a Fibre Bragg Grating (FBG). These seeds enable wavelength control. We verify the effectiveness of the combination of LMF, with appropriate mode spacing, in combination with natural chirp effects from the seed to control the SBS threshold in a broad range of output energies, from a few to some tens of µJ. These variations are discussed versus all the parameters of the laser system. In accordance with the proposal of a couple of basic principles and with the addition of gain saturation effects along the active fibre, we develop a full-vectorial numerical model. Fine fits between experimental results and theoretical expectations are demonstrated. The only limitation of the technique arises from broadband beating noise, which is analysed thanks to a simplified, but fully representative description to discuss the signal-to-noise ratio of the amplified pulses. This provides efficient tools for application to the design of robust and cost-effective MOPAs, aiming to the generation of finely shaped and energetic nanosecond pulses without the need for any additional electro-optics.

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“…Our MO solution of choice is amplitude-modulated diode lasers [22][23][24]. These lasers naturally support the generation of agile pulse waveforms, in which pulse duration and temporal profile as well as inter-pulse time interval can be dynamically and precisely controlled via electronics on a pulse-to-pulse basis, as demonstrated by their ubiquitous use in optical telecommunication transmitters.…”

Section: Introductionmentioning

confidence: 99%

“…This issue has been addressed by means of specialty fibers, in which fundamental transverse mode operation is retained through particular designs and/or techniques. One example is ''photonic crystal'' fibers (PCFs), in which good BQ from exceedingly large cores (up to 100 lm diameter) is ensured by making the core/cladding index step exceedingly low (core numerical aperture 60.04), which supports the guidance of only few transverse modes [19,[21][22][23]29,30,[32][33][34][35]. This very weak in-core wave-guidance is obtained by means of a carefully designed cross-sectional microstructure of high-index-contrast regions.…”

Section: Introductionmentioning

confidence: 99%