Abstract
In Chapter 2, we have described femotosecond polarization beats in three-and four-level systems with two pump laser beams having two frequency components in each beam. The femtosecond beating comes from the frequency difference between two atomic transitions, therefore named difference frequency polarization beats (DFPB), when the two pump beams have a relative time delay. However, for a different situation with a time delay between two frequency components in each pump beam, the polarization beat signal will appear with a sum frequency of two atomic transitions, which is called sum-frequency polarization beats (SFPB). Such SFPB can result in beating signals with attosecond time scale; therefore, such SFPB technique has sometimes been called attosecond polarization beats (ASPB). Such SFPB technique can be used effectively for certain ultrafast laser spectroscopy measurements. In this chapter, we will describe how such SFPB appear in multilevel systems and how the signal intensity of the SFPB changes for different Markovian stochastic fields. Based on the phase-conjugate polarization interference between two-pathway excitations, the second-order or fourth-order Markovian stochastic correlations of the SFPB in attosecond time scale have been studied in a three-level V-type system. Field correlations have weakly influence on the SFPB signal when the lasers have narrow bandwidths. In contrast, when lasers have broadband linewidths, the SFPB signal shows the resonant-nonresonant cross correlation, and sensitivities of the SFPB signal to three Markovian stochastic models increase as the time delay is increased.
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(2009). Attosecond Polarization Beats. In: Multi-Wave Mixing Processes. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-89528-2_3
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DOI: https://doi.org/10.1007/978-3-540-89528-2_3
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