Abstract
In the previous chapters, we have mainly discussed ultrafast polarization beats with multi-level atomic systems, in which laser beams are always near resonance with the atomic transitions. In this chapter, we will turn our attention to some different problems, i.e. to investigate Raman- and Rayleigh-enhanced polarization beats in liquids and solid materials, in which thermal and reorientational gratings are important. In liquids and solid materials, both resonance and nonresonance excitations contribute significantly to the nonlinear optical processes. We present methods to study the Raman-enhanced polarization beats (REPB) with broadband noisy lights using chaotic field, phase-diffusion, and Gaussian-amplitude models. The interferometric contrast ratio of the detected polarization beat signal is shown to be particularly sensitive to amplitude and phase fluctuations of Markovian stochastic fields with arbitrary bandwidth. It is found that the beat signal oscillates not only temporally but also spatially. The overall accuracy of using the REPB to measure the Raman resonant frequency is determined by the relaxation rates of Raman modes and the molecular-reorientational grating. Another interesting feature in field correlations is Rayleigh-enhanced polarization beats. Rayleigh-enhanced four-wave mixing (RFWM) and Raman-enhanced four-wave mixing with color-locking noisy lights shows spectral symmetry and temporal asymmetry that no coherence spike exists at τ=0.
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(2009). Raman- and Rayleigh-enhanced Polarization Beats. In: Multi-Wave Mixing Processes. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-89528-2_5
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DOI: https://doi.org/10.1007/978-3-540-89528-2_5
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