Collimated Definition

verb

Simple past tense and past participle of collimate.

Wiktionary
adjective

Of light beams whose rays are parallel and thus has a plane wavefront.

2008. "Wolf-Rayet stars are also argued to give rise to gamma-ray bursts, a related but rare class of explosions characterized by highly-collimated relativistic jets." An extremely luminous X-ray outburst at the birth of a supernova.
Wiktionary