Adaptive control of pulse phase in a chirped-pulse amplifier

Efimov, Anatoly; Moores, M.D.; Beach, N.M.; Krause, Jeffrey L.; Reitze, D. H.

doi:10.1364/ol.23.001915

Cited by 64 publications

(26 citation statements)

References 12 publications

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“…SHG intensity in the desired band is increased significantly. The signal to background ratio SB < 400 nm or SB > 400 was 30. This means that the background was only 3 % of the total SHG signal.…”

Section: Selective Excitation Of a Chromophore Using Bps And A Gamentioning

confidence: 97%

“…The search space for the problem described above, using BPS, is of size 2 N . If we considered a 100 pixel shaper, the search space would be of size 10 30 . If we use 32 pixels to optimize any two-photon excitation process, then there are only~10 5 possible phase shapes.…”

Section: Selective Excitation Of a Chromophore Using Bps And A Gamentioning

confidence: 99%

“…[22] Since that time, many experiments based on a feedback-optimized genetic algorithm (GA) for control of different nonlinear optical process have been reported. Optimization of SHG has received the most attention (see results by the Silberberg and co-workers, [23][24][25] Gerber and co-workers, [26][27][28] Reitze and co-workers, [29][30][31][32] Kannari and co-workers, [33][34][35] Murnane, Kapteyn and co-workers, [36,37] Motzkus and co-workers, [38] Miller and co-workers, [39,40] Baltuska and Kobayashi, [41,42] Corkum and co-workers [43] and Keller and co-workers [44][45][46] ). Subsequent applications include control of chemical reaction yields, [47][48][49][50][51][52][53][54][55][56] 2PA in isolated atoms [57][58][59] and in complex solutions, [60,61] energy distribution in small molecules, [62][63][64][65] polymers, [66] and bio-mol...…”

Section: Introductionmentioning

confidence: 99%

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Systematic Control of Nonlinear Optical Processes Using Optimally Shaped Femtosecond Pulses

Lozovoy¹,

Dantus²

2005

ChemPhysChem

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This article reviews experimental efforts to control multiphoton transitions using shaped femtosecond laser pulses, and it lays out the systematic study being followed by us for elucidating the effect of phase on nonlinear optical laser-molecule interactions. Starting with a brief review of nonlinear optics and how nonlinear optical processes depend on the electric field inducing them, a number of conclusions can be drawn directly from analytical solutions of the equations. From a Taylor expansion of the phase in the frequency domain, we learn that nonlinear optical processes are affected only by the second- and higher-order terms. This simple result has significant implications on how pulse-shaping experiments are to be designed. If the phase is allowed to vary arbitrarily as a continuous function, then an infinite redundancy that arises from the addition of a linear phase function across the spectrum with arbitrary offset and slope could prevent us from carrying out a closed-loop optimization experiment. The early results illustrate how the outcome of a nonlinear optical transition depends on the cooperative action of all frequencies in the bandwidth of a laser pulse. Maximum constructive or destructive interference can be achieved by programming the phase using only two phase values, 0 and pi. This assertion has been confirmed experimentally, where binary phase shaping (BPS) was shown to outperform other alternative functions, sometimes by at least on order of magnitude, in controlling multiphoton processes. Here we discuss the solution of a number of nonlinear problems that range from narrowing the second harmonic spectrum of a laser pulse to optimizing the competition between two- and three-photon transitions. This Review explores some present and future applications of pulse shaping and coherent control.

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Section: Selective Excitation Of a Chromophore Using Bps And A Gamentioning

confidence: 97%

Section: Selective Excitation Of a Chromophore Using Bps And A Gamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Systematic Control of Nonlinear Optical Processes Using Optimally Shaped Femtosecond Pulses

Lozovoy¹,

Dantus²

2005

ChemPhysChem

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“…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%

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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“…Thus, even nasty, deeply modulated spectra with side wings are compressible almost to the Fourier limit by cutting off the unwanted spectral components: much less work is then required to generate smooth spectra, as has been shown in the compression of pulses from a hollow fiber. The purpose of these two experiments has not been to produce the shortest pulse but rather to show that the principle of feedback controlled pulse shaping is a promising tool for pulse compression [63,92,133].…”

Section: Discussionmentioning

confidence: 99%