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Optics Communications

Laser induced polarization properties of a neon three-level system

Birger Stahlberg, Peter Jungner, Tomas Fellman, Kalle‐Antti Suominen, Stig Stenholm

Published Jun 1, 1990• 6 citations
Publisher
DOI
10.1016/0030-4018(90)90425-s

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The polarization state of laser light is affected by the nonlinear processes in the matter it passes through. Wieman and Hancsh’ used this effect to investigate the spectra of molecular systems. Another example is the laser-based investigations of parity-breaking weak interactions,2 In this contribution we investigate polarization changes induced by a three-level cascade system when laser light is used to break the left-right symmetry of the atom. By causing the asymmetry externally we can manipulate the effect and observe its magnitude and signal shape. Works related to ours are those by Liao and Bjorklund.3,4

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We have observed the Doppler-free dichroism and birefringence induced by a linearly polarized laser beam (pump beam) by monitoring the polarization and amplitude changes of a weak probe beam through an analyzer. The effects have been observed in two-level systems and also in three-level systems of Ne I. At rather low pump power, a typical refractive-index anisotropy of 10−8 has been measured. We have shown that, when the normal resonance curve exhibits a broad background due to collisions, our method allows the elimination of this background. In addition, using a rotating analyzer, we have obtained simultaneously the dichroism and birefringence curves, i.e., the imaginary and real part of the anisotropic-induced susceptibility.

Journal of Applied Physics•Jul 1, 1978•20 citations
A theoretical calculation of the polarization changes of a weak probe laser beam as it traverses a strongly pumped gaseous atomic medium is presented. The medium is chosen to be a three-level cascade (J = 0–J = 1–J = 0) system. The polarization of the probe changes from linear to elliptical owing to the asymmetrical population transfer induced by a strong, circularly polarized pumping laser beam. We study this phenomenon as a function of laser intensities, laser detunings, and the relaxation parameters of the medium. We compare the predictions of the theory with results obtained from experimental studies of the neon 1s4(J = 1)–2p4(J = 2)–3s2(J = 1) system.
The polarization state of laser light is affected by the nonlinear processes in the matter it passes through. Wieman and Hancsh’ used this effect to investigate the spectra of molecular systems. Another example is the laser-based investigations of parity-breaking weak interactions,2 In this contribution we investigate polarization changes induced by a three-level cascade system when laser light is used to break the left-right symmetry of the atom. By causing the asymmetry externally we can manipulate the effect and observe its magnitude and signal shape. Works related to ours are those by Liao and Bjorklund.3,4
We have observed the Doppler-free dichroism and birefringence induced by a linearly polarized laser beam (pump beam) by monitoring the polarization and amplitude changes of a weak probe beam through an analyzer. The effects have been observed in two-level systems and also in three-level systems of Ne I. At rather low pump power, a typical refractive-index anisotropy of 10−8 has been measured. We have shown that, when the normal resonance curve exhibits a broad background due to collisions, our method allows the elimination of this background. In addition, using a rotating analyzer, we have obtained simultaneously the dichroism and birefringence curves, i.e., the imaginary and real part of the anisotropic-induced susceptibility.