photon echo
preferred label: پژواک فوتونی @fa
type: Concept
broader: optical coherent transient

optical coherent transient
alternative label: optical nutation
narrower: photon echo
broader: nonlinear optics
preferred label: حالت گذرای همدوس نوری @fa
type: Concept

nonlinear optics
preferred label: نورشناسی غیرخطی @fa
type: Concept
narrower: optical coherent transient