Fourwave
Fourwave, often written four-wave mixing (FWM), is a nonlinear optical interaction in which four light waves interact within a medium to generate new frequency components. The process arises from the third-order nonlinear susceptibility of the medium and conserves energy and momentum, requiring phase matching for efficient conversion.
In a typical three-input interaction, three waves at frequencies ω1, ω2, and ω3 combine to produce a
Applications of fourwave mixing are broad. It is used for wavelength conversion in fiber-optic communications, enabling
Challenges include phase-matching limitations due to material dispersion, competition from other nonlinear processes such as stimulated