Frequency tripling into the 720–1025-Å region with pulsed free jets

Abstract

We have developed a coherent source of XUV light, which is continuously tunable between 904 and 1024 Å, and line tunable to 720 Å. It employs the technique of frequency tripling in a pulsed free jet of gas, and requires a single tunable laser system. Spectra of the relative XUV output vs wavelength in the 904–1024-Å range are presented for the tripling gases Ar, Kr, Xe, CO, and N2. Also listed are relative outputs obtained by tripling at resonantly enhanced lines between 720 and 900 Å in Kr, Xe, and CO. Possible improvements to the source are discussed, and examples of its application are given.