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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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Introduction

Introduction

Chapter:
(p.1) 1 Introduction
Source:
Nonlinear Optics and Photonics
Author(s):

Guang S. He

Publisher:
Oxford University Press
DOI:10.1093/acprof:oso/9780198702764.003.0001

This chapter describes the formation, development, and major subjects of nonlinear optics and photonics. The semiclassical theory treats the light as a classical electromagnetic field governed by Maxwell equations, while the optical medium is a molecular system governed by quantum mechanics; the key parameters for this theory are various-order nonlinear susceptibilities. The quantum theory of radiation treats light as an ensemble of photons and the medium as a molecular system, both of which are described by quantum mechanics, and the key aspect is the concept of the so-called intermediate state represented by a virtual energy state level. The semiclassical theory gives a concise quantitative description of various nonlinear multi-wave mixing effects as well as those nonlinear processes related to the induced refractive-index changes. In contrast, the quantum theory of radiation can provide a conceptual interpretation for almost all known nonlinear optical effects and phenomena.

Keywords:   Nonlinear optics, photonics, semiclassical theory, quantum theory of radiation, intermediate state, virtual energy level, nonlinear susceptibility, multi-wave mixing, refractive-index change

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