formule de Schawlow-Townes
1976 / The uncertainty principle and the spectral width of a laser beam / Hugo Weichel / American Journal of Physics 44 (1976) p. 839 [doi]
1978 / A simple derivation of the bandwidth of a laser oscillator / L. W. Anderson ; J. E. Lawler / American Journal of Physics 46 (1978) p. 162 [doi]
1979 / How monochromatic is laser light? / Stephen F. Jacobs / American Journal of Physics 47 (1979) p. 597 [doi]