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Nonlinear Optics and Photonics$
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Guang S. He

Print publication date: 2014

Print ISBN-13: 9780198702764

Published to Oxford Scholarship Online: December 2014

DOI: 10.1093/acprof:oso/9780198702764.001.0001

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Induced Refractive-Index Changes

Induced Refractive-Index Changes

(p.83) 5 Induced Refractive-Index Changes
Nonlinear Optics and Photonics

Guang S. He

Oxford University Press

In conventional optics, the refractive index of a material at a given wavelength is a constant independent of light intensity. Since the advent of lasers, it has been found that the refractive index can be a variable upon the action of intense coherent light. Bases on the third-order nonlinear polarization mechanisms, the induced refractive-index change is proportional to the intensity of the incident laser beam, whereas in a second-order nonlinear medium it can be proportional to the amplitude of the intense coherent light field. Intense coherent light induced refractive-index change is the fundamental process involved in several major nonlinear optical effects, including self-focusing, self-phase modulation, optical phase conjugation, optical bistability, and optical solitons. It is also the physical basis for the development of novel devices and techniques for all-optical switching and steering, real-time holography, and optical data storage and processing.

Keywords:   Intensity-dependent refractive-index change, amplitude-dependent refractive-index change, nonlinear optical media, intense coherent light

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