Abstract
In this chapter, phase-sensitive heterodyne (or homodyne) detection technique is developed in investigating real (dispersion) and imaginary (absorption) parts of high-order nonlinear susceptibilities using color-locked twin noisy fields. In a three-level system, the complex third-order nonlinear susceptibility is determined by heterodyning signals from the two-photon ND-FWM with the reference signal from another one-photon DFWM process in the same system, which propagate along the same optical path and have the same frequency. By controlling the relative phase between these two co-existing nonlinear wave-mixing processes, the third-order nonlinear absorption and dispersion of such ultrafast polarization beat signals can be obtained. Using such phase-sensitive heterodyne detection technique, real and imaginary parts of the fifth-order (χ(5)) and seventh-order (χ(7)) nonlinear susceptibilities can be determined through beating between the SWM signal and a FWM reference (local oscillator) beam and between the EWM signal and a SWM reference (local oscillator) beam, respectively, in specially designed energy-level configurations. The greatly enhanced third- fifth- and seventh-order nonlinear responses with different signs can be modified and controlled through the color-locked correlations of twin noisy fields. Determining and controlling real and imaginary parts of the high-order nonlinear susceptibilities is very important in understanding the propagation of high-intensity pulses and solitons, and can lead to many other interesting applications.
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(2009). Heterodyne/Homodyne Detection of MWM. In: Multi-Wave Mixing Processes. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-89528-2_4
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DOI: https://doi.org/10.1007/978-3-540-89528-2_4
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