Abstract
Doppler-free flame spectrometry based on polarization-modulated optical phase conjugation in an air-acetylene flame is reported as a sensitive analytical technique with high spectral resolution using a relatively weak continuous-wave dye laser. Optical signal detection is efficient since the signal is a coherent time-reversed replica of the probe beam. Utilizing polarization properties of the phase conjugate wavefront and the resonant degenerate four-wave mixing process, polarization-modulated detection is demonstrated to offer many advantages. Signal-to-noise ratio is enhanced by at least a factor of 20 as compared to amplitude-modulated detection. Detection limit of Doppler-free sodium spectrum is reported at 0.2 ng ml .
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