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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

Johansson, Sveneric LU and Letokhov, Vladilen LU (2005) In New Astronomy 10(5). p.361-369
Abstract
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; Johansson, S., Letokhov, V., 2003. Phys. Rev. Lett. 90 (1) 01110-1; Johansson, S., Letokhov, V., 2004. A&A 428, 497]. 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 '', we suggest... (More)
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; Johansson, S., Letokhov, V., 2003. Phys. Rev. Lett. 90 (1) 01110-1; Johansson, S., Letokhov, V., 2004. A&A 428, 497]. 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 '', we suggest the use of the Brown-Twiss-Townes optical heterodyne intensity correlation interferometry. The estimates made of the SIN ratio for the optical heterodyne astrophysical laser experiment imply that it is feasible. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
stars : individual : eta, techniques : interferometric, resolution, instrumentation : high angular, atomic processes, line : profiles, Carinae
in
New Astronomy
volume
10
issue
5
pages
361 - 369
publisher
Elsevier
external identifiers
  • wos:000228790500002
  • scopus:16344392562
ISSN
1384-1092
DOI
10.1016/j.newast.2005.01.003
language
English
LU publication?
yes
id
1fa927f5-a5e1-413b-87db-1f6e86c90428 (old id 243165)
date added to LUP
2007-08-22 10:55:08
date last changed
2017-08-20 03:44:02
@article{1fa927f5-a5e1-413b-87db-1f6e86c90428,
  abstract     = {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; Johansson, S., Letokhov, V., 2003. Phys. Rev. Lett. 90 (1) 01110-1; Johansson, S., Letokhov, V., 2004. A&A 428, 497]. 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 '', we suggest the use of the Brown-Twiss-Townes optical heterodyne intensity correlation interferometry. The estimates made of the SIN ratio for the optical heterodyne astrophysical laser experiment imply that it is feasible.},
  author       = {Johansson, Sveneric and Letokhov, Vladilen},
  issn         = {1384-1092},
  keyword      = {stars : individual : eta,techniques : interferometric,resolution,instrumentation : high angular,atomic processes,line : profiles,Carinae},
  language     = {eng},
  number       = {5},
  pages        = {361--369},
  publisher    = {Elsevier},
  series       = {New Astronomy},
  title        = {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},
  url          = {http://dx.doi.org/10.1016/j.newast.2005.01.003},
  volume       = {10},
  year         = {2005},
}