2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/217133We demonstrate an efficient nonlinear process in which Stokes and anti-Stokes components are generated spontaneously in a Raman-like, near resonant media driven by low power counter-propagating fields. Oscillation of this kind does not require optical cavity and can be viewed as a spontaneous formation of atomic coherence grating.Quantum Physicstext