Numéro |
J. Phys. IV France
Volume 01, Numéro C7, Décembre 1991
2nd International ConferenceLaser M2P |
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Page(s) | C7-551 - C7-554 | |
DOI | https://doi.org/10.1051/jp4:19917144 |
Laser M2P
J. Phys. IV France 01 (1991) C7-551-C7-554
DOI: 10.1051/jp4:19917144
USE OF AN ALIASING ARTEFACT IN FT SPECTROMETRY TO DISTINGUISH BETWEEN PULSED AND CONTINUOUS EMISSIONS OCCURING IN THE SAME SOURCE
R. STRINGAT1, G. FABRE1, J.M. MOUREAUX1 and A.J. ROSS21 Laboratoire d'Optique Atomique et Moléculaire, Faculté des Sciences, Parc Valrose, F-06034 Nice cedex, France
2 Laboratoire de Spectrométrie Ionique et Moléculaire, Université Lyon I, 43 boulevard du 11 novembre 1918, F-69622 Villeurbanne cedex, France
Abstract
Spectral aliasing can be usefully employed to differentiate between emission from pulsed and continuous sources when recording spectra on a continuous scanning Fourier transform spectrometer. Examples are given using a pulsed copper vapour laser to excite fluorescence in the presence of strong blackbody radiation. The continuous emission is sampled at regular optical path differences [MATH] and shows no aliasing in the spectral range [MATH]. The pulsed emission is slaved to the interferometer at a frequency which is half that of the interferometer sampling rate producing a duplicate of the pulsed spectrum [MATH] at [MATH]. The two can thus be distinguished, provided that the ghosts appear in a spectral region which contains no true lines.
© EDP Sciences 1991