Abstract

Stimulated Raman scattering is a quantum macroscopic process starting from an unstable state. Any fluctuations, initial or boundary, classical or quantum in nature, lead to the macroscopic output fluctuations of the Stokes amplitude. Manifestations of these fluctuations in the statistics of the Stokes pulse energy and its spectrum have been studied extensively for the linear stage of the SRS.^[1] Another fluctuation phenomenon arises in the nonlinear stage of the SRS - random spikes, usually called soliton-like, are observed in the depleted pump.^[2] Here we show that the reason for these solitonlike spikes is the conservation of the relative phase Δϕ =ϕ_L − ϕ_S +ϕ_Q of the laser, Stokes and the polarization waves.^[3]

© 1992 IQEC