Possibility of measuring the width of narrow FeII astrophysical laser lines in the vicinity of eta Carinae by means of Brown-Twiss-Townes heterodyne correlation interferometry
We consider the possibility of measuring the true width of the narrow Fe II optical lines observed in spectra of the Weigelt blobs in the vicinity of eta Carinae. The lines originate as a result of stimulated amplification of spontaneous emission of radiation in quantum transitions between energy levels showing inverted population [Johansson, S., Letokhov, V., 2002. JETP Lett. 75 (10) 495; Johanss