25 December: Mollow's "Power spectrum of light scattered by two-level systems"
First exact derivation by Benjamin Mollow of what will later be recognized as the correct lineshape of resonance fluorescence, in particular of the Mollow triplet. The derivation relies on a semiclassical model (not quantizing the light field) and Lax's quantum regression theorem. This is one of the most important papers on the topic.
1February (1977): Kimble & Mandel[4]'s discovery that dephasing produces asymmetric triplets (in their case from the driving laser of finite bandwidth with a diffusing phase). This is an important paper as the first of a long series studying such asymmetries.
Hassan & Bullough's first (they call it "more fundamental") approach to mixed coherent+chaotic driving of the 2LS,[5] finding an asymmetric triplet. Details also appear in a discussion appended to Ref. [6] but their main paper is Ref. [7].