Tunable coherent radiation in the ultraviolet and vacuum ultraviolet has been generated by stimulated Raman scattering, by anti-Stokes Raman lasers, and by frequency mixing processes in non-linear media. The theory and experimental progress in the development of these laser-driven sources is reviewed, and examples of available systems and their characteristics are discussed. Various applications in spectroscopy of radiation tunable in the wavelength region 200-90 nm are presented.
B. P. Stoicheff,
"Generation Of Tunable Vacuum Ultraviolet Radiation For Spectroscopy", Proc. SPIE 1033, Trends in Quantum Electronics, (18 May 1989); doi: 10.1117/12.950657; https://doi.org/10.1117/12.950657