Minimization of dispersion in an ultrafast chirped pulse amplifier using adaptive learning

Efimov, Anatoly; Moores, M.D.; Mei, Bill; Krause, Jeffrey L.; Siders, C. W.; Reitze, D. H.

doi:10.1007/s003400000282

Cited by 33 publications

(21 citation statements)

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“…From previous experiments, we know that the end result of such an optimization is a bandwidth-limited laser pulse. [27][28][29][30][31][32][33][34] Therefore, the emission intensities measured at the end of the optimization ͑indicated by the open circles to the upper right of the dia-gram͒ are a result of the most intense laser pulses available. Comparing these data to the maximization of emission itself ͑solid circles͒, it is seen that the evolution curves are very similar.…”

Section: A Optimization Of Emission and Shgmentioning

confidence: 99%

“…24 Recently we have reported photoselectivity in a liquid-phase environment, 25 and even energy transfer in a biomolecular system has been controlled. 26 In addition, there are a number of examples where the technique has been used for automated pulse compression [27][28][29][30][31][32][33][34] or in the design of arbitrary laser pulse shapes. 16,35 One important potential use of adaptive control is in chemical synthesis where light could be exploited as a controllable reagent for the production of reactive intermediates or the formation of specific products.…”

Section: Introductionmentioning

confidence: 99%

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Liquid-phase adaptive femtosecond quantum control: Removing intrinsic intensity dependencies

Brixner

Damrauer

Kiefer

et al. 2003

The Journal of Chemical Physics

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Adapting optimal control theory and using learning loops to provide experimentally feasible shaping mask patterns Femtosecond adaptive pulse shaping of 800-nm laser pulses is applied to control the multiphoton molecular excitation of the charge-transfer coordination complex ͓Ru(dpb) 3 ͔(PF 6 ) 2 ͑where dpb ϭ4,4Ј-diphenyl-2,2Ј-bipyridine) dissolved in methanol. A phase-only femtosecond pulse shaper provides a mechanism for multiparameter ͑128͒ variation of the incident field, and a closed-loop evolutionary algorithm optimizes pulse shapes within the vast search space. Molecular emission at 620 nm is used as experimental feedback which is proportional to the excited-state population in the long-lived 3 MLCT ͑metal-to-ligand charge-transfer͒ state. The dominant intensity dependence of the multiphoton excitation process is removed by using second-harmonic generation ͑SHG͒ in a thin optical crystal as a general ''reference'' signal. Successful control of the emission/SHG ratio demands that the field adapt to the electronic structure or dynamic needs of the molecule in solution. This suggests that adaptive femtosecond pulse shaping can provide a general means of finding field shapes capable of selectively exciting molecules based on their unique optical properties.

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Section: A Optimization Of Emission and Shgmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Liquid-phase adaptive femtosecond quantum control: Removing intrinsic intensity dependencies

Brixner

Damrauer

Kiefer

et al. 2003

The Journal of Chemical Physics

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“…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.…”

Section: Introductionmentioning

confidence: 99%

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

Prawiharjo¹,

Daga²,

Geng³

et al. 2008

Opt. Express

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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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“…Eliminating SPM can also remove some of the complications employed to avoid nonlinearities, such as the use of large core multimode fibers, photonic crystal fibers and the large amounts of dispersion necessary for stretching. 33,34 Compensation of SPM in CPA systems has been shown by using the negative nonlinear index (n 2 ) of semiconductor materials, 35 using a spatial light modulator in a pulse-shaping configuration, 36,37 and by residual third-order dispersion (TOD). 38,39 However, the wavelength dependence of semiconductor parameters degrades the quality of compensation for pulses less than ~1 ps, and linear and two-photon absorption limit the thickness of the material and thus the amount of nonlinear phase that can be practically removed.…”

Section: Generation Of Negative Nonlinear Index Of Refraction For Commentioning

confidence: 99%

Application of telecom technologies to optical instrumentation

Howe

2006

SPIE Proceedings

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In this tutorial, we will show several novel optical instruments using optical phase modulation, which is a common technique used in fiber optic communications for phase shift keying and chirped RZ transmission. We will cover the concept of space-time duality, time-lens for jitter compensation and pulse compression, time-prism for ultrafast tunable optical delay, and generation of effective negative nonlinear refractive index using electro-optic phase modulation for compensation of self-phase modulation. These device concepts are inspired by the rapid technological development in telecom, and demonstrate the great potential of applying telecom technologies to optical instrumentation.

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Minimization of dispersion in an ultrafast chirped pulse amplifier using adaptive learning

Cited by 33 publications

References 0 publications

Liquid-phase adaptive femtosecond quantum control: Removing intrinsic intensity dependencies

Liquid-phase adaptive femtosecond quantum control: Removing intrinsic intensity dependencies

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

Application of telecom technologies to optical instrumentation

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