Multichannel Selective Femtosecond Coherent Control Based on Symmetry Properties

Amitay, Zohar; Gandman, Andrey; Chuntonov, Lev; Rybak, Leonid

doi:10.1103/physrevlett.100.193002

Cited by 43 publications

(43 citation statements)

References 38 publications

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“…The resulting spectral widths by far exceed experimentally realistic values. As a result, only solutions using one-photon transitions are found while the experimental result of non-resonant two-photon control [24][25][26][27][28][29][30][31][32][33] could not be reproduced. Here we employ optimal control theory with spectral constraints to enforce a non-resonant two-photon solution.…”

Section: Control Of Non-resonant Two-photon Absorptionmentioning

confidence: 99%

“…Non-resonant two-photon absorption has been studied experimentally for ns to (n + 1)s transitions in alkali atoms in the weak [24][25][26], strong [27][28][29] and intermediate field regime [30][31][32][33]. To date, optimal control calculations of non-resonant two-photon absorption have been hampered by a spectral spread of the field.…”

Section: Control Of Non-resonant Two-photon Absorptionmentioning

confidence: 99%

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Optimal control under spectral constraints: enforcing multi-photon absorption pathways

Reich¹,

Palao²,

Koch³

2013

Journal of Modern Optics

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Shaped pulses obtained by optimal control theory often possess unphysically broad spectra. In principle, the spectral width of a pulse can be restricted by an additional constraint in the optimization functional. However, it has so far been impossible to impose spectral constraints while strictly guaranteeing monotonic convergence. Here, we show that Krotov's method allows for simultaneously imposing temporal and spectral constraints without perturbing monotonic convergence, provided the constraints can be expressed as positive semi-definite quadratic forms. The optimized field is given by an integral equation which can be solved efficiently using the method of degenerate kernels. We demonstrate that Gaussian filters suppress undesired frequency components in the control of non-resonant two-photon absorption.

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Section: Control Of Non-resonant Two-photon Absorptionmentioning

confidence: 99%

Section: Control Of Non-resonant Two-photon Absorptionmentioning

confidence: 99%

Optimal control under spectral constraints: enforcing multi-photon absorption pathways

Reich¹,

Palao²,

Koch³

2013

Journal of Modern Optics

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“…Most coherent control schemes have been applied to the weak-field excitation regime, in which the energy level structure of the system is effectively unaltered by the excitation field, and the dynamics can be described using perturbation theory [2,3]. In this regime, coherent control using both adaptive (closed loop) and analytic pulse-shaping schemes have been extensively reported [4][5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Strong-field spatiotemporal ultrafast coherent control in three-level atoms

et al. 2010

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Simple analytical approaches for implementing strong field coherent control schemes are often elusive due to the complexity of the interaction between the intense excitation field and the system of interest. Here, we demonstrate control over multiphoton excitation in a three-level resonant system using simple, analytically derived ultrafast pulse shapes. We utilize a two-dimensional spatiotemporal control technique, in which temporal focusing produces a spatially dependent quadratic spectral phase, while a second, arbitrary phase parameter is scanned using a pulse shaper. In the current work, we demonstrate weak-to-strong field excitation of 85 Rb, with a π phase step and the quadratic phase as the chosen control parameters. The intricate dependence of the multilevel dynamics on these parameters is exhibited by mapping the data onto a two-dimensional control landscape. Further insight is gained by simulating the complete landscape using a dressed-state, time-domain model, in which the influence of individual shaping parameters can be extracted using both exact and asymptotic time-domain representations of the dressed-state energies.

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“…According to the actual requirements, coherent control by the pulse-shaping technique can be performed by an open-loop scheme with a predesigned spectral phase or/and amplitude pattern or a closed-loop scheme based on a learning algorithm [1]. Nowadays, the quantum control strategy making use of a shaped femtosecond laser pulse has been successfully applied in the control of two-and multiphoton absorption [6][7][8][9], highorder-harmonic generation [10], stimulated Raman scattering [11,12], coherent anti-Stokes Raman scattering spectroscopy [13][14][15][16][17], photoionization and photodissociation [18][19][20][21], and so on.…”

mentioning

confidence: 99%

Achieving high-resolution photoelectron spectroscopy from a broadband femtosecond laser pulse

Zhang

Jia

et al. 2012

Phys. Rev. A

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Femtosecond-induced resonance-enhanced multiphoton-ionization photoelectron spectroscopy (REMPI-PS) suffers from poor spectral resolution due to the large laser spectral bandwidth. In this paper, we present a scheme to achieve high-resolution REMPI-PS in the potassium atom by shaping the ultrashort femtosecond laser pulse. Our results show that the REMPI-PS bandwidth can be narrowed by several tens of times with a cubic spectral phase modulation, and thus high-resolution REMPI-PS and the fine structure of the energy-level diagram for multiple excited states can be obtained in spite of the broadband femtosecond laser pulse. Furthermore, we explain the physical control mechanism of the narrowband REMPI-PS by considering the two-photon power spectrum.

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Multichannel Selective Femtosecond Coherent Control Based on Symmetry Properties

Cited by 43 publications

References 38 publications

Optimal control under spectral constraints: enforcing multi-photon absorption pathways

Optimal control under spectral constraints: enforcing multi-photon absorption pathways

Strong-field spatiotemporal ultrafast coherent control in three-level atoms

Achieving high-resolution photoelectron spectroscopy from a broadband femtosecond laser pulse

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