High energy femtosecond fiber chirped pulse amplification system with adaptive phase control

He, Chaobin; Hung, H.S.S.; Daga,; Naz,; Prawiharjo,; Price, '; Hanna,; Shepherd, D.P.; Richardson, Malcolm; Dawson,; Siders,; Barty,

doi:10.1109/cleo.2008.4551343

Cited by 4 publications

(6 citation statements)

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“…The pulse from port 1 has a FWHM duration of 70 fs (1.54 times transform limited, which is typical for this NPE rejected port of this type of fiber laser). Some residual third order dispersion remains, so the duration may be reduced further using an SLMbased pulse shaper [24,25]. The PICASO calculations for port 2 show a primary pulse compressed to 47 fs.…”

Section: B Performancementioning

confidence: 99%

Simulations and experiments showing the origin of multiwavelength mode locking in femtosecond, Yb-fiber lasers

et al. 2016

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A stable and self-starting femtosecond breathing-pulse Yb-fiber oscillator is reported, modelocked using the nonlinear polarisation evolution mechanism. A bifurcation between two distinct modes of operation is demonstrated experimentally, producing pulses with a single central wavelength in one state, or following adjustment of the intra-cavity waveplates, the emission of pulses with three distinct central wavelengths. The maximum bandwidth was 72 nm at the -10 dB level and the pulses were compressible externally to 70 fs with energies of 0.75 nJ. The multi-wavelength pulses reported here are significantly shorter than the pico-second pulses previously observed from similar modelocked multi-wavelength sources. Vector simulations based on the nonlinear Schrödinger equation show that the multi-wavelength behaviour is produced by overdriving the nonlinear polarisation evolution based saturable absorber at the peak of the pulse, leading to transmission of the two wings of the strongly chirped pulse. This new insight shows clearly that the three pulses output in the multi-wavelenght state are coherent. The agreement between simulation and experimental data shows nonlinear polarisation evolution based modelocked fiber lasers are a suitable platform for studying the nonlinear dynamics underlying the bifurcation of the output.

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Section: B Performancementioning

confidence: 99%

Simulations and experiments showing the origin of multiwavelength mode locking in femtosecond, Yb-fiber lasers

et al. 2016

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“…A grating-based stretcher followed, and this had a standard design described in detail in Ref. [18] and was used previously in a similar fiber CPA system producing 100 µJ pulses with a comparable compressed duration [19]. The stretched pulse duration was 1 ns at the intensity FWHM, and the stretcher transmission window was 14 nm (edge-to-edge) with a central wavelength of 1045 nm, chosen for high gain per unit length in the final amplifier with minimal gain narrowing.…”

Section: Fiber Cpa Systemmentioning

confidence: 99%

“…Active phase optimization as used in Ref. [19] is one option for further increasing the peak power by reducing the energy in the pulse pedestal by compensating for nonlinear distortion in the amplifier chain.…”

Section: Fiber Cpa Performancementioning

confidence: 99%

Efficient high-harmonic generation from a stable and compact ultrafast Yb-fiber laser producing 100 μJ, 350 fs pulses based on bendable photonic crystal fiber

et al. 2017

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Section: Introductionmentioning

confidence: 99%

“…In fiber CPA systems, amplitude-only shaping has recently been demonstrated to control the nonlinear-phase modulation induced by SPM at low energy [4], but it cannot compensate for higherorder spectral phase due to the material dispersion. Our group recently demonstrated a phase-only shaping to produce high-quality pulses in a high-energy fiber laser system [5].In this paper, we report our latest experimental result in generating high-fidelity femtosecond pulses in a fiber CPA system by adaptive amplitude and phase pre-shaping [6]. A pulse shaper based on a dual-layer liquid crystal spatial light modulator (LC-SLM) was implemented in the fiber CPA system for amplitude and phase shaping prior to amplification.…”

mentioning

confidence: 99%

High fidelity femotosecond pulses from an ultrafast fiber laser system via adaptive amplitude and phase pre-shaping

Prawiharjo

Daga

Geng

et al. 2009

Advanced Solid-State Photonics

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Abstract:We report the generation of a 12.6W average power, 50MHz repetition rate pulse train, compressible to high fidelity 170fs pulses, from an ultrafast ytterbium-doped fiber laser system via adaptive amplitude and phase pre-shaping. IntroductionYtterbium-doped fibre laser systems, coupled with the chirped-pulse amplification (CPA) technique, have allowed the realization of compact ultrafast laser systems producing high average power at various repetition rates [1]. Power scaling in fibre CPA systems is non-trivial, because a number of factors can degrade the pulse fidelity at the output, such as uncompensated material dispersion, nonlinearity, and a non-uniform spectral gain profile with finite width. Due to the optical confinement and long interaction length of the fiber geometry, nonlinear effects, most notably self-phase modulation (SPM), are a critical consideration in constructing fiber CPA laser systems. However, conventional approaches in mitigating SPM have limitations; temporal stretching is physically limited by the finite size of the grating compressor, while the scaling of large-mode-area (LMA) fibers will eventually undermine the advantages of fiber geometry. Hence, novel approaches in mitigating SPM are necessary for further power scaling in fiber CPA laser systems while maintaining pulse fidelity.Adaptive pulse shaping allows for the generation of high-fidelity pulses by controlling the spectral phase profile [2]. However, due to damage limitations, pulse shaping often needs to be implemented prior to high power amplification in CPA systems [3]. In fiber CPA systems, amplitude-only shaping has recently been demonstrated to control the nonlinear-phase modulation induced by SPM at low energy [4], but it cannot compensate for higherorder spectral phase due to the material dispersion. Our group recently demonstrated a phase-only shaping to produce high-quality pulses in a high-energy fiber laser system [5].In this paper, we report our latest experimental result in generating high-fidelity femtosecond pulses in a fiber CPA system by adaptive amplitude and phase pre-shaping [6]. A pulse shaper based on a dual-layer liquid crystal spatial light modulator (LC-SLM) was implemented in the fiber CPA system for amplitude and phase shaping prior to amplification. The LC-SLM was controlled using a differential evolution (DE) algorithm, to maximize a two-photon absorption (TPA) detector signal produced by the compressed fiber CPA output pulses. We show that our approach compensates for both accumulated phase from higher-order material dispersion and nonlinear phase modulation. A train of pulses with an average power of 12.6 W at a 50 MHz repetition rate was produced from the fiber CPA system, compressible to high fidelity pulses with a full-width at half-maximum (FWHM) duration of 170 fs.

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High energy femtosecond fiber chirped pulse amplification system with adaptive phase control

Cited by 4 publications

References 0 publications

Simulations and experiments showing the origin of multiwavelength mode locking in femtosecond, Yb-fiber lasers

Simulations and experiments showing the origin of multiwavelength mode locking in femtosecond, Yb-fiber lasers

Efficient high-harmonic generation from a stable and compact ultrafast Yb-fiber laser producing 100 μJ, 350 fs pulses based on bendable photonic crystal fiber

High fidelity femotosecond pulses from an ultrafast fiber laser system via adaptive amplitude and phase pre-shaping

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