Assertion: laser's medium | /r/CreatedBy | 3p 4 transition
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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).