Spin superradiant devices can generate coherent microwaves at power levels reported to "set the air on fire". Superradiance is a form of coherent emission but not all coherent emissions are from superradiant origins. Typical lasers output coherent light that does not come from superradiant phenomena; however, there are now masers and lasers that have enhanced coherence using superradiant phenomena.
What is Superradiance or Super-Radiance per wikipedia
Spin Superradiance versus Atomic Superradiance
Origin of Pure Spin Superradiance
The Role of a Resonant Cavity
Superradiant Operation of Spin Masers
Coherent radiation by magnets with exchange interactions
Patents for Spin Superradiant devices: