Figure 2: Strontium titanate maser construction.
From: Enhanced magnetic Purcell effect in room-temperature masers
(a) Rendered image of strontium titanate (SrTiO3) maser. (b) Plot of magnetic energy-density distribution in the cross-section through maser displaying high concentration within the pentacene:p-terphenyl gain medium. The microwave magnetic field in the TE01δ mode behaves like a magnetic dipole and induces X↔Z transitions in the pentacene triplet-state sublevels by having a magnetic field component along the molecular y-axes.
