For efficient lasing to occur, there are several conditions that must be met:[1] Alternate design proposals involve free undulators akin to a free-electron laser.
[2][3] Several proposals involve exploiting the momentum transport properties of superconductors, where s-waves and d-waves couple distinctly to gravitational radiation.
With the necessary energy levels found in gravitational potentials of the planet's core and mantle, the resulting 'graser' beams are initially employed to nudge the singularities somewhere safer.
Earth Unaware (2012) uses 'glasers' as a plot device to enable planetary-scale manipulation of matter, akin to gravity guns.
In Alastair Reynolds' novel Redemption Ark (2002), a graser is utilised by the Inhibitors to bore into, and puncture, Resurgam's sun.