Nonlinear phenomena can be used in two general ways, one in applications such as second-harmonic generation, lasers, phase conjugation, optical bistability, etc. Alternatively one can use them to study the properties of the medium that generates them. The various kinds of nonlinear spectroscopy fall into the second category. Saturation spectroscopy deals typically with the cw absorption of waves passing through a medium to be studied. In the simplest case, a probe wave acts alone and one studies the probe absorption as a function of the intensity. The formulas for this are given earlier in Sec. 5-1, since this problem is of substantial use not only in spectroscopy, but also in laser theory and optical bistability.
KeywordsCoherence Convolution Refraction Pier Reso
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