Abstract

Sodium vapor confined in a heatpipe oven is irradiated by a single beam of the 578.72-nm laser line. A 215.2-nm emission is observed in this work. This emission is assumed to be generated through a high-order nonlinear wave mixing process. The mixing scheme includes the well-known six-wave mixing generated 840.3 nm¹,² near infrared emission. It may also be described by a mixing scheme of four-wave mixing including the 840.3 nm.

© 1991 Optical Society of America