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Quantum Electronics and Laser Science Conference

Observation of high-frequency coherent vibrational motion with strongly chirped probe pulses

Polli, Brida, Lanzani, Cerullo

Published Jan 1, 2009• 0 citations
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Observation of high-frequency coherent vibrations with strongly chirped probe pulses

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It is nowadays possible to generate, in different spectral ranges, ultrabroadband light pulses with transform-limited (TL) duration corresponding to a few optical cycles. Whenever broadband pulses are employed, the dispersion experienced by the pulses causes a frequency chirp which may severely lengthen their duration and influence time-resolved measurements. While it is well known that the relative weight of ground-state versus excited-state oscillations can be controlled by the chirp in the pump pulse, the effects of probe pulse chirp have not been fully investigated. In this paper we show, both theoretically and experimentally, that a pump-probe experiment using strongly-chirped probe pulses can preserve the temporal resolution of the TL pulses.

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It is nowadays possible to generate, in different spectral ranges, ultrabroadband light pulses with transform-limited (TL) duration corresponding to a few optical cycles. Whenever broadband pulses are employed, the dispersion experienced by the pulses causes a frequency chirp which may severely lengthen their duration and influence time-resolved measurements. While it is well known that the relative weight of ground-state versus excited-state oscillations can be controlled by the chirp in the pump pulse, the effects of probe pulse chirp have not been fully investigated. In this paper we show, both theoretically and experimentally, that a pump-probe experiment using strongly-chirped probe pulses can preserve the temporal resolution of the TL pulses.
Recent calculations [1, see also 2-5] indicate that suitably timed sequences of electronically preresonant femtosecond laser pulses can induce large amplitude coherent molecular vibrations of dilute chromophores in low temperature hosts, without undue electronic absorption or other loss processes. Here we demonstrate that frequency modulation, in the forms of variable pulse center frequency and variable chirp rate, can significantly further enhance the efficiency of impulsive stimulated Raman preparation of coherent vibrations in the electronic ground state.