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Article Dans Une Revue Journal of Physics B: Atomic, Molecular and Optical Physics Année : 2008

Towards the adaptive optimization of field-free molecular alignment

Résumé

We theoretically report the optimization of field-free molecular alignment by spectral phase shaping of femtosecond laser pulses. Optimal pulse shapes are designed iteratively by an evolutionary algorithm in conjunction with a non perturbative regime calculation. The investigation is conducted in O2 and N2 under realistic conditions of intensity, temperature and pulse shaping. We demonstrate that specific tailored pulses can provide significant maximization of the field-free alignment compared to Fourier Transform Limited pulses of same energy. The underlying control mechanism is discussed. The effect of pulse energy and temperature is analyzed leading to the identification of a general criteria for a successfull optimization. Finally, the optimal spectral phase learned from the algorithm is rather smooth and can be described by a representation in terms of sigmoidal function. We show that the use of a low-dimensional parametrization of the phase yields an efficient optimization of the alignment within a highly reduced convergence time.

Dates et versions

hal-00397175 , version 1 (19-06-2009)

Identifiants

Citer

Arnaud Rouzée, Edouard Hertz, Bruno Lavorel, Olivier Faucher. Towards the adaptive optimization of field-free molecular alignment. Journal of Physics B: Atomic, Molecular and Optical Physics, 2008, 41 (7), pp.074002. ⟨10.1088/0953-4075/41/7/074002⟩. ⟨hal-00397175⟩
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