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Nonlinear Optics, 3rd Edition by Robert W. Boyd

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Chapter 6 Nonlinear Optics in the Two-Level Approximation

6.1. Introduction

Our treatment of nonlinear optics in the previous chapters has for the most part made use of power series expansions to relate the response of a material system to the strength of the applied optical field. In simple cases, this relation can be taken to be of the form

image

However, there are circumstances under which such a power series expansion does not converge, and under such circumstances different methods must be employed to describe nonlinear optical effects. One example is that of a saturable absorber, where the absorption coefficient α is related to the intensity ...

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