Fig. 1: Schematic cross-section of the microwave cavity-resonator setup.
From: Maser threshold characterization by resonator Q-factor tuning
a Microwave cavity, holding the sapphire ring resonator. The schematic shows half of the cavity to reveal the interior. The light blue sapphire ring is held by two Teflon holders. On the top is the iris coupled waveguide port. The coupling to the resonator is adjusted by a Teflon screw with a metal ring at its tip. The 532 nm optical pump laser is aligned along the symmetry axis of the cylindrical resonator, while the static magnetic field B0 is perpendicular to it. Finally, the diamond sample is placed inside the resonator. b Loaded Q-factor as a function of the resonator coupling, showing the full range of coupling, with the diamond sample in the resonator.
