Nonlinear Optical Effect
The nonlinear optical effect can be divided into two major categories: the parametric process and the non-parametric process. The characteristic of the parametric process is that the state of the nonlinear optical medium does not change before and after the process, and the energy is only converted between different electromagnetic wave modes. In principle, such processes can be handled by solving specific coupling equations under certain boundary conditions. Harmonic generation, four-wave mixing, multi-wave parametric oscillation, etc. all belong to the parametric process. Their common feature is the need to consider phase matching. A typical example of a non-parametric process is stimulated Raman scattering, in which nonlinear frequency conversion can also be achieved, but there is no need to consider phase matching because the state of the medium itself has changed before and after the process. Phase matching is the conservation of energy and conservation of momentum. In fiber-optic transmission systems, especially when many wavelengths of high power are transmitted into the same fiber in WDM mode, the most influential nonlinear effects are four-wave mixing (FWM), stimulated Raman scattering (SRS), and stimulated cloth. Liyuan scattering.
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