Collision-Induced Coherences in Optical Physics
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This chapter discusses collision-induced coherence in optical physics. The chapter presents a general framework for the calculation of nonlinear susceptibilities by taking into account spontaneous emission, elastic, and inelastic collisions. It shows how other physical observables such as fluorescence can be calculated and how the dephasing-induced phenomena can be understood in terms of the dressed states. Using the general expressions, the chapter discusses the existence of collision-induced resonance in fluorescence and ionization spectroscopy, saturated absorption spectroscopy, four-wave mixing, and six-wave mixing. The chapter also presents the relation between the collision-induced resonances in second-order and third-order response of the system and discusses the effects of cross-relaxation on collision-induced coherences. The chapter also describes the collision-induced resonances in spontaneous processes and treats the question of narrowing and enhancement of signals because of the velocity-changing collisions. The chapter concludes with a discussion on several other mechanisms that lead to coherences similar to collision-induced coherences. 1992, Elsevier Inc. All rights reserved.
