A rotating black hole called a Kerr black hole by physicists, can serve as a power amplifier. If you surround the black hole with a spherical mirror and then inject a small amount of radiant energy from a star at just the right angle to the rotating black hole that energy will skim the surface of the hole's event horizon.
If done properly the radiant energy will be 'dragged' by the frame-dragging effect of the black hole's immense gravity around the hole and emerge amplified. Do this several times and you can amplify the energy from an ordinary star to huge levels.
The radiant energy is injected at a certain frequency and the resultant amplification shifts that frequency. Always remembering that as the energy increases the frequency of a photon of electromagnetic energy also increases.
Just as radio waves can travel through certain materials while being reflected by others the mirror appears transparent at the lower and upper frequencies of the injected radiant energy and opaque at frequencies in between.
In this way radiant energy can be injected into the spherical mirror and emerge amplified where it can then deposit that energy in a conversion layer blanketing the sphere.
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