Surface plasmons to generate coherent photons from non-coherentphotons?

cyber one

Assuming you are limited to a non-coherent light source for
generating surface plasmons and you want to produce coherent photons
from the surface plasmons:

I assume the non-coherent light would produce non-coherent plasmons.

If so, are there methods to make the short-lived non-coherent
plasmons coherent, such as by electrostatic or other forces or some
type of filter or nano grooves to force coherence of the plasmons?

Or, are there methods to generate coherent light from non-coherent
plasmons?