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[en] The nonlinear interaction of two laser beams in an absorbing medium can be detected with high sensitivity by Polarization Intermodulated Excitation (POLINEX). We have demonstrated this technique with Doppler-free spectroscopy of excited helium and neon atoms in glow discharges, using optogalvanic or fluorescence detection. The neon spectra are free of Doppler-broadened background despite velocity changing elastic collisions. (orig.)
Journal
Optics Communications; ISSN 0030-4018; 
; v. 37(2); p. 87-91
; v. 37(2); p. 87-91