Assertion: erbium's state | /r/HasProperty | broadened into spaced sublevels
Facets:
value: with ground
type: OTHER
value: closely
type: DEGREE
value: to excited state transition
type: PURPOSE
Source sentences:
text: At 1480 nm, pumping directly excites the upper sublevels of the 4I 13/2 metastable manifold (the excited state is broadened into closely spaced sublevels due to Stark splitting), with ground to excited state transition