Coherent preparation of media by adiabatic passage techniques,
e.g. Stimulated Raman Adiabatic Passage (STIRAP) or
Stark-chirped rapid adiabatic passage (SCRAP), provides powerful
tools to control properties and processes in atomic or molecular media.
Among the applications are the preparation of population inversion
or the efficient manipulation of optical (in particular nonlinear optical)
properties of matter. 
The talk reports on enhancement of frequency conversion processes to yield
short-wavelength, extreme-ultraviolet (XUV) radiation by more than
one order of magnitude in a medium, coherently prepared by Stark-chirped
rapid adiabatic passage (SCRAP). Moreover experiments, dealing
with the efficient generation of large-bandwidth Raman sidebands
in media, coherently stimulated by ultra-short (fs) radiation pulses,
are also discussed