Searching for Optical Lasers in Emission-Line Stars

Details Searching for Optical Lasers in Emission-Line Stars Searching for Optical Lasers in Emission-Line Stars

Aug 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007jena.confe..26d&link_type=abstract

"JENAM-2007, "Our non-stable Universe", held 20-25 August 2007 in Yerevan, Armenia. Abstract book, p. 26-26"

Astronomy and Astrophysics

Astronomy

Scientific paper

Natural laser emission may be produced whenever radiative mechanisms overpopulate suitable atomic energy levels. Well-studied cases are optical emission lines from gas ejecta around the extremely luminous star Eta Carinae. Theoretically expected linewidths are very narrow, requiring spectral resolution around 100 million, far beyond classical spectroscopy. Such resolutions are feasible with nanosecond-resolution photon-correlation spectroscopy, a quantum-optical method of analyzing the autocorrelation function of photon arrival times. Observations with large telescopes are simulated both numerically, and in a laboratory experiment measuring narrow emission lines with photon-counting avalanche photodiodes. Further discussion: http://www.astro.lu.se/~dainis/

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