J. Phys. IV France 01 (1991) C7-551-C7-554
USE OF AN ALIASING ARTEFACT IN FT SPECTROMETRY TO DISTINGUISH BETWEEN PULSED AND CONTINUOUS EMISSIONS OCCURING IN THE SAME SOURCER. STRINGAT1, G. FABRE1, J.M. MOUREAUX1 and A.J. ROSS2
1 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
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