Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-01-13
New Astron. 10 (2005) 361-369
Astronomy and Astrophysics
Astrophysics
Accepted for publication in New Astronomy
Scientific paper
10.1016/j.newast.2005.01.003
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 & Letokhov, 2002, 2003, 2004). The lines should have a subDoppler spectral width of 30-100 MHz, depending on the geometry of the lasing volume. To make measurements with a spectral resolution of R>10^7 and an angular resolution better than 0.1 arcsec, we suggest the use of the Brown-Twiss-Townes optical heterodyne intensity correlation interferometry. The estimates made of the S/N ratio for the optical heterodyne astrophysical laser experiment imply that it is feasible.
Johansson Sara
Letokhov V. S.
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