Assertion: ne laser | /r/ObjectUse | used in laboratory demonstrations
Facets:
value: in the field of optics
type: LOCATION
value: because of ease
type: CAUSE
value: compared to other visible lasers
type: OTHER
value: widely
type: DEGREE
Source sentences:
text: They are widely used in laboratory demonstrations in the field of optics because of their relatively low cost and ease of operation compared to other visible lasers producing beams of similar quality in terms of spatial coherence (a single-mode Gaussian beam) and long coherence length (however, since about 1990 semiconductor lasers have offered a lower-cost alternative for many such applications).