Abstract
The signal from a standard degenerate-four- wave mixing (DFWM) experiment has contributions from both the real and imaginary (absorption) parts of the variation induced in the refractive index. However, the separation of these two components is important in the characterization of novel third- order nonlinear materials. Recently Saltiel et al.1 developed a double phase-conjugate four-wave-mixing arrangement that makes it possible to measure both the real and imaginary parts of the instantaneous third- order nonlinear susceptibility, x(3) and x(3), respectively. We present here a new interferometric design that eliminates some of the limitations in the double four-wavemixing arrangement, such as pulse-width requirements and fixed delays.
© 1994 Optical Society of America
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