Generation of coherent extreme-ultraviolet and infrared radiation using six-wave mixing in argon

Abstract
Several six-wave mixing processes generating extreme-ultraviolet and infrared radiation have been observed in argon gas excited by high-power subpicosecond 248-nm radiation. The processes involve waves over a very large spectral range, spanning the region between 63 nm and 4.3 μm. In addition, two nonparametric transitions are observed whose origin has not been determined