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Optics Communications

Comments on “saturation of the Hanle effect by intense broad-band laser radiation”

M. Ducloy

Published May 1, 1973• 4 citations
Publisher
DOI
10.1016/0030-4018(73)90171-5

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Nonlinear effects in optical pumping with lasers. II. Possible radiative narrowing of the Hanle resonance at the classical limit

M. Ducloy

For pt.I see ibid., vol.9, p.357 (1976). A theory of the optical pumping of high-J molecule levels with a broad-band CW laser has previously been developed. The linewidth of the Hanle effect is analysed in the present paper for two particular cases in which an exact integration is possible. These cases are: (i) gT (where g is the Lande factor and T the lifetime) is the same for the two levels; and (ii) one of the Lande factors vanishes. In general, the Hanle resonance is power-broadened for high laser intensities. However, in the case of a zero Lande factor of the ground state, the theory predicts a radiative narrowing of the Hanle effect. It is shown that this most unusual feature is connected to the fact that, in the latter case, the physical observables of the resonance level may get the ground-state lifetime, when the transition is saturated.

Journal of Physics B Atomic and Molecular Physics•Apr 1, 1976•0 citations

Hanle effect in an atomic beam excited by a narrow-band laser

J. L. Picqué

The Hanle effect of a hyperfine transition (connecting two levels with a non-zero angular momentum) in a sodium atomic beam, induced by a CW single-mode dye laser, has been investigated for various radiation intensities. A qualitative explanation and a quantitative interpretation of the experimental results are given. The features characteristic of the narrow-band pumping radiation are emphasised.

Journal of Physics B Atomic and Molecular Physics•Feb 14, 1978•20 citations

Non-linear effects in optical pumping with lasers. I. General theory of the classical limit for levels of large angular momenta

M. Ducloy

The optical pumping of high J levels with a broad-band CW laser is studied theoretically. Exact non-perturbative solutions are obtained by means of a Fourier development of the response of the irradiated medium. This leads to such theoretical predictions as the depolarization of the fluorescence for high laser intensities, the power broadening of the Hanle effect and the appearance of a zero-field saturation resonance in the pi fluorescence. All these theoretical predictions are finally compared with recent experiments on the optical pumping of molecules especially Na 2 and I 2 .

Journal of Physics B Atomic and Molecular Physics•Feb 21, 1976•25 citations
For pt.I see ibid., vol.9, p.357 (1976). A theory of the optical pumping of high-J molecule levels with a broad-band CW laser has previously been developed. The linewidth of the Hanle effect is analysed in the present paper for two particular cases in which an exact integration is possible. These cases are: (i) gT (where g is the Lande factor and T the lifetime) is the same for the two levels; and (ii) one of the Lande factors vanishes. In general, the Hanle resonance is power-broadened for high laser intensities. However, in the case of a zero Lande factor of the ground state, the theory predicts a radiative narrowing of the Hanle effect. It is shown that this most unusual feature is connected to the fact that, in the latter case, the physical observables of the resonance level may get the ground-state lifetime, when the transition is saturated.
The optical pumping of high J levels with a broad-band CW laser is studied theoretically. Exact non-perturbative solutions are obtained by means of a Fourier development of the response of the irradiated medium. This leads to such theoretical predictions as the depolarization of the fluorescence for high laser intensities, the power broadening of the Hanle effect and the appearance of a zero-field saturation resonance in the pi fluorescence. All these theoretical predictions are finally compared with recent experiments on the optical pumping of molecules especially Na 2 and I 2 .