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Chinese Physics Letters

Study on the high resolution polarization spectroscopy of sodium D 1 line

J. S. Fu, Hu Yuan-hui

Published Nov 1, 1986• 0 citations
Publisher

Abstract

The polarization spectroscopy of Na D 1 line with linearly polarized pumping light is studied theoretically using velocity-selective optical pumping model. The experimental results are in good agreement with the theoretical analysis.
DOI
10.1088/0256-307x/3/11/009

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Doppler-free spectra of linear and circular dichroisms for the hyperfine structures of Na D1{D}_{1}D1​ and D2{D}_{2}D2​ lines have been obtained by means of polarization-modulated optical pumping spectroscopy. The experimental results are compared with recent theoretical calculations based on velocity-selective optical pumping in a four-level atomic system.
The aim of this paper is to present detailed theory of polarization spectroscopy of Na in the case of a slow relaxation rate of a lower state involved in a resonant transition. An interpretation of the signal in such a polarization spectroscopy is given by combining the theory of birefringence and dichroism with a first-order theory of velocity-selective optical pumping in a four-level system. Because of the high multiplicity of Zeeman levels, the signal is complicated by the occurrence of cross-over resonances in addition to the principal resonances. This interpretation is in good agreement with the experimental results which have been already published about the Na D 1 line.
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The relative intensities of the Doppler-free signals in the transition from polarized and dispersive signals to absorptive signals of the Na D1 line are calculated theoretically from the approximation of a single cycle of opticalpumping in a four-level system. The transition from polarized signals to saturated signals is made by varying the angle of an analyzer. Since the signal in polarization spectroscopy is mixed with the signal in saturation spectroscopy during the transition, spurious signals due to saturation and polarization effects should be taken into account in the signal analysis of polarization and saturation spectroscopies, respectively. Both theories, of polarization spectroscopy and saturation spectroscopy are unified and applied to the Doppler-free signals of the Na D1 line. The results obtained from the four-level optical pumping theory which mixes polarization spectroscopy with saturation spectroscopy are in good agreement with experimental reports.