  We present an extended theoretical library of over 800 synthetic stellar
spectra, covering energy distribution in the optical range (lambda = 3500-7000
angstrom), at inverse resolution R=500000. The library, based on the ATLAS9
model atmospheres, has been computed with the SYNTHE code developed by R.L.
Kurucz. The grid spans a large volume in the fundamental parameter space (i.e.
effective temperature, surface gravity, metallicity), and can be profitably
applied to different research fields dealing both with the study of single
stars and stellar aggregates, through population synthesis models. A
complementary project, in progress, will extend the wavelength range to the
ultraviolet, down to 850 angstrom, at an inverse resolution of R=50000.
