Abstract
Typical parametric four-wave mixing (PFWM) processes are well documented in Na vapors.1 These processes in general involve emissions that are nonresonant in nature and must satisfy the phase matching conditions (Δk = 0, where Δk is the phase mismatch between the laser and generated photons) by adjusting the angles of the k vectors of the generated waves. This results in the production of conically emitted light about the axis of the pump laser and only in the direction of the laser photons.
© 1988 Optical Society of America
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