  We report spectroscopy experiments of rubidium vapor in a high magnetic field
under conditions of electromagnetically induced transparency (EIT) and optical
pumping. The 1.1 T static magnetic field decouples nuclear and electronic spins
and shifts each magnetic state via the Zeeman effect, allowing us to resolve
individual optical transitions of the D$_2$ line in a Doppler-broadened medium.
By varying the control laser power driving one leg of a spectrally isolated
$\Lambda$ system we tune the vapor from the EIT regime to conditions of
Autler-Townes line splitting. The resulting spectra conform to simple
three-level models demonstrating the effective simplification of the energetic
structure. Further, we quantify the viability of state preparation via optical
pumping on nuclear spin-forbidden transitions. We conclude that the
``cleanliness'' of this system greatly enhances the capabilities of quantum
control in hot vapor, offering advantages in a broad variety of quantum
applications plagued by spurious light-matter interaction processes, such as
atomic quantum memories for light.
