Compensation of resonant atomic dispersion using a pulse shaper

Delagnes, Jean-Christophe; Monmayrant, Antoine; Zahariev, P.V.; Arbouet, Arnaud; Chatel, Béatrice; Girard, B.; Bouchène, M. A.

doi:10.1007/s00340-006-2549-7

Cited by 5 publications

(3 citation statements)

References 27 publications

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“…Assuming a two-photon absorption spectrum that is wider than the pulse bandwidth, the 2PF intensity at any point (x,y,z) in space is given by: I 2PF (x, y, z) / I 2 (x, y, z, t)dt, where I(x,y,z,t) is the excitation field intensity at the point (x,y,z) at time t. Thus, as the input pulse total energy E = I(x, y, z, t)dtdxdy is fixed, the maximum 2PF is obtained for the field that is focused to the smallest possible spatial extent and the shortest temporal duration. This approach is in the extension of temporal pre-compensation of dispersion of an ultrashort pulse (Delagnes et al, 2007) to the opaque lens.…”

Section: Resultsmentioning

confidence: 99%

Light fields in complex media: Mesoscopic scattering meets wave control

2017

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The newly emerging field of wave front shaping in complex media has recently seen enormous progress. The driving force behind these advances has been the experimental accessibility of the information stored in the scattering matrix of a disordered medium, which can nowadays routinely be exploited to focus light as well as to image or to transmit information even across highly turbid scattering samples. We will provide an overview of these new techniques, of their experimental implementations as well as of the underlying theoretical concepts following from mesoscopic scattering theory. In particular, we will highlight the intimate connections between quantum transport phenomena and the scattering of light fields in disordered media, which can both be described by the same theoretical concepts. We also put particular emphasis on how the above topics relate to application-oriented research fields such as optical imaging, sensing and communication.

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Section: Resultsmentioning

confidence: 99%

Light fields in complex media: Mesoscopic scattering meets wave control

2017

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“…Otherwise, interaction before resonance results in negligible effects. Similarly, in propagation experiments, interferences between the field radiated by the atom and the incoming field leads to interferences which can be used as a partial analysis of the field such as chirp [15] or dispersion [16] measurements.…”

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confidence: 99%

Quantum State Measurement Using Coherent Transients

2006

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We present the principle and experimental demonstration of Time Resolved Quantum State Holography. The quantum state of an excited state interacting with an ultrashort chirped laser pulse is measured during this interaction. This has been obtained by manipulating coherent transients created by the interaction of femtosecond shaped pulses and rubidium atoms.PACS numbers: 32.80. Qk, 42.50Md, 82.53.Kp Quantum state measurement is a central issue of fundamental importance to quantum mechanics [1,2]. Since only probabilities can be predicted by quantum mechanics, the phase of a wave function seems at first sight to carry no information. However, relative phases between quantum states are crucial in many circumstances such as prediction of the free or driven evolution of the system, or the measurements of quantities (observables) related to the superposition of quantum states with different energies.Several examples of quantum phase measurements of states created by ultrashort pulses are based on interferences between an unknown wave function and a "reference" wave function. These wave functions are created by a sequence of two ultrashort pulses (an unknown pulse and a reference pulse). In quantum state holography, the quantum state created by the unknown pulse is deduced either by time-and frequency-integrated fluorescence measured as a function of the delay [3,4], or by measuring the population of each eigenstate for different values of the relative phases [5], or the amplitude of fluctuations when the delay is randomly fluctuating [6,7]. In fluorescence tomography, position probability distributions are measured as a function of time [8,9]. For instance, the dispersed fluorescence emitted by an oscillating nuclear wave packet in a diatomic molecule provides the position distribution through the Franck-Condon principle [8]. Alternatively the induced dipole can be obtained from heterodyne measurement [10]. More recently the internuclear quantum states of dissociating molecules have been elegantly measured by tomography using velocity map imaging [11].In all these examples, the quantum state is first prepared and then measured in a second step. In the work reported here, the quantum state is measured during the interaction with the unknown laser pulse. Its evolution is thus recorded in real time.When the matter-light interaction is in the linear regime, the final state populations can be entirely deduced from the power spectrum. This is for instance the case for a one-photon transition in the weak field regime. However, the phase of the wave function is sensitive to the various phases of the electric field. This can have important consequences for applications where a subsequent excitation is performed, in particular when coherent superpositions are involved.The transient evolution of excited state population is also strongly dependent on the details of the pulse shape. In particular, non-resonant contributions are as important as resonant ones. As an intuitive illustration of this statement, the transient response...

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“…In parallel, the propagation of ultrafast pulses through strongly dispersive media has been a topic of research for many years. Atmospheric aberrations have been successfully compensated [22] as well as the dispersion due to thick optical media [23]. However, despite some insight into the multiple scattering of ultrafast pulses [24][25][26], measurement of the scattering medium transfer function at a single speckle grain via scanning the frequency of a c.w.…”

Section: Introductionmentioning

confidence: 99%

Spatio-temporal focusing of an ultrafast pulse through a multiply scattering medium

et al. 2011

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Pulses of light propagating through multiply scattering media undergo complex spatial and temporal distortions to form the familiar speckle pattern. There is much current interest in both the fundamental properties of speckles and the challenge of spatially and temporally refocusing behind scattering media. Here we report on the spatially and temporally resolved measurement of a speckle field produced by the propagation of an ultrafast optical pulse through a thick strongly scattering medium. By shaping the temporal profile of the pulse using a spectral phase filter, we demonstrate the spatially localized temporal recompression of the output speckle to the Fourier-limit duration, offering an optical analogue to time-reversal experiments in the acoustic regime. This approach shows that a multiply scattering medium can be put to profit for light manipulation at the femtosecond scale, and has a diverse range of potential applications that includes quantum control, biological imaging and photonics.

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Compensation of resonant atomic dispersion using a pulse shaper

Cited by 5 publications

References 27 publications

Light fields in complex media: Mesoscopic scattering meets wave control

Light fields in complex media: Mesoscopic scattering meets wave control

Quantum State Measurement Using Coherent Transients

Spatio-temporal focusing of an ultrafast pulse through a multiply scattering medium

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