Assertion: laser's medium | /r/CreatedBy | the 5s 2
Facets:
Source sentences:
text: The medium becomes capable of amplifying light in a narrow band at 1.15 μm (corresponding to the 4s 2 to 3p 4 transition) and in a narrow band at 632.8 nm (corresponding to the 5s 2 to 3p 4 transition).