Inside a ring made of the proper material, the light, acted upon by exterior magnetic fields, tended to move in a circle, so that the photon cascade effect was all in one direction instead of bouncing back and forth between a pair of mirrors.
"The Foreign Hand Tie"
Gordon Randall Garrett
Now, as we know, that size photon doesn't exist for the excellent reason that it can't in this space.
"Invaders from the Infinite"
John Wood Campbell
This stuff should be able, with the aid of a molecular motion beam, which will make all the photons move in parallel paths, to move at the full speed of each photon-186,000 miles a second.
"The Black Star Passes"
John W Campbell