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Journal of Experimental and Theoretical Physics

On the theory of polarization phenomena in the spectroscopy of two-quantum transitions

Anatoly I. Burshtein, Э. Г. Сапрыкин, Gennady I. Smirnov

Published Nov 1, 1974• 0 citations
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Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE•May 30, 2002•0 citations
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.
We study polarization spectroscopy of Rb vapour. A weak probe beam analyses the birefringence induced in a room temperature vapour by a strong counterpropagating circularly polarized pump beam. In contrast to most other work on polarization spectroscopy, we use a polarization beam splitting cube and two detectors (rather than a polarizer and one detector) to analyse the probe beam. The signal is in the form of a derivative of a Lorentzian. For theoretical analysis we study the closed atomic transition 5 2 S 1/2 ( F = 3) → 5 2 P 3/2 ( F ' = 4) in the D2 line of 85 Rb. We study the time needed to redistribute population among the m F states, derive an expression for the expected lineshape and present experimental data in excellent agreement with theory. The polarization spectrum provides an ideal error signal for frequency stabilization of a laser. We describe the geometry and parameters for optimizing the error signal.
Spontaneous coherence transfer has been studied experimentally using two-color laser polarization spectroscopy of 87Rb. Two classes of optical transitions were investigated for which the theory predicts presence and absence of anisotropy of a hyperfine sublevel of the ground state populated via spontaneous decay. The anisotropy was induced by a strong linearly polarized laser beam. It was controlled by the polarization rotation of another probe laser beam. A qualitative agreement with the theoretical predictions has been found.