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Maximizing the amplitude of coherent phonons with shaped laser pulses
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View: Figures


Image of FIG. 1.
FIG. 1.

Model schematic of our study. A Fourier-limited input pulse is shaped by a freely programmable pulse shaper with filter function H. The resulting pulse E(t) exerts a force F(t) onto a phonon mode, inducing a time-dependent displacement Q(t). The goal is to reach a maximum amplitude in the time-domain.

Image of FIG. 2.
FIG. 2.

Optimizing laser-driven lattice displacement. (a) Intensity profiles I(t) of the Fourier-limited laser pulse and the fittest, shaped pulses from the first, 972nd, and last generation of the optimization process. (b) Intensity spectrum of the Fourier-limited pulse. (c) Progress of the optimization process for the case of ISRS and DECP excitation of the coherent phonon mode at . The fitness is normalized to that of the Fourier-limited input pulse. Arrows mark the selected generations shown in (a), (d)-(f) for the case of ISRS-type excitation. (d) Simulated coherent phonon dynamics for pulses shown in (a). (e) Spectral amplitude A and (f) phase of the pulse shaper's filter function for the pulses shown in (a).

Image of FIG. 3.
FIG. 3.

Illustration of Eq. (4) describing the phonon excitation process for the case of ISRS-type coupling. Coherent-phonon excitation may be understood as a sequential excitation by a series of -like pulses that follow the intensity envelope I(t) of the excitation pulse (topmost curve). The resulting displacement Q(t) is a sum of all these events, three of which are indicated in the figure.


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Scitation: Maximizing the amplitude of coherent phonons with shaped laser pulses