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Optics and Spectroscopy

Luminescence spectrum in far wings of the resonance line of cesium atoms approaching a sapphire surface

Sergey G. Przhibel'skii

Published Jun 1, 2007• 0 citations
Publisher

Abstract

The shape of the luminescence spectrum of Cs atoms flying near a sapphire surface is described phenomenologically for the detuning from the D 2 line ranging within 5–50 cm −1 . The numerical fitting of one theoretical parameter and a small variation of another parameter ensures a satisfactory agreement with the experimental spectrum. The experimentally determined abnormally high intensity of the antistatic wing is explained by the effect of phase relaxation of the atomic transition, caused by fluctuations of the electric field of oscillating ions of the sapphire crystal lattice.

DOI
10.1134/s0030400x0706001x

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Journal of Nonlinear Optical Physics & Materials•Jul 1, 1996•0 citations
The shape of the luminescence spectrum of Cs atoms flying near a sapphire surface is described phenomenologically for the detuning from the D 2 line ranging within 5–50 cm −1 . The numerical fitting of one theoretical parameter and a small variation of another parameter ensures a satisfactory agreement with the experimental spectrum. The experimentally determined abnormally high intensity of the antistatic wing is explained by the effect of phase relaxation of the atomic transition, caused by fluctuations of the electric field of oscillating ions of the sapphire crystal lattice.
The shape of the luminescence spectrum of Cs atoms flying near a sapphire surface is explored experimentally and described phenomenologically for the detuning range of 5 to 50 cm-1 on both sides of D2 line. The numerical fitting of one theoretical parameter and a small variation of another parameter ensure a satisfactory agreement with the experimental spectrum. The experimentally determined abnormally high intensity of the antistatic wing is explained by the effect of phase relaxation of the atomic transition, caused by fluctuations of the electric field of oscillating ions of the sapphire crystal lattice.
The spectrum of resonantly excited luminescence of Cs atoms in a microcell with sapphire windows has been studied. Spectral wings of atomic luminescence near the windows have been revealed near (±50 cm−1) the D2 line of the excited 6S 1/2–6P 3/2 transition. At the same time, the radiation of the D1 line has been found. The features of the spectrum of the far wings, namely, the exponential shape and the relatively small difference between the static and the antistatic wings, as well as the radiation of the D1 line, have been explained by the mixing of fine-structure states due to interactions of Cs atoms with the sapphire windows. From the relative intensity of the lines, it has been determined that the probability of luminescence quenching at the window surfaces differs from unity by no less than 1/700.
The spectrum of the luminescence in the far wing of the atomic spectral line due to the atom-surface collisions between cesium atoms and sapphire surface is obtained experimentally. A cw diode laser operating at the wavelength of 852.1 nm resonant to the 6S1/2 - 6P3/2 transition in the free Cs atoms was used to excite the luminescence of atomic vapors. To avoid atom-atom collisions a specially designed spectroscopic cell with two sapphire windows only 3 μm apart was employed. The wings were measured for the detuning up to 200 cm-1 on both sides ofthe atomic spectral line. Besides the wings, luminescence at the wavelength of 894.3 nm corresponding to the 6S1/2 - 6P1/2 transition was observed. Notwithstanding high quenching probability, more than 0.5% of the atoms leave the surface in the state of another fine-structure component.
The changes in the states of excited Rb atoms approaching a single-crystal sapphire surface have been investigated by methods of laser-excitation spectroscopy and luminescence of Rb vapor in a cell with sapphire windows, the gap between which was varied from 250 to 500 nm. Upon resonant excitation of Rb atoms by two semiconductor lasers with powers of 20 and 40 mW, luminescence from optically excited 5D 3/2 and 5D 5/2 states and optically unexcited 6P 1/2 and 6P 3/2 states is observed. It is established that the luminescence intensity from unexcited states is only a few times lower than that from excited states, with allowance for the fact that excited atoms are rapidly and almost completely quenched on the sapphire surface. The found anomalously strong luminescence from optically unexcited 6P J states is explained by their nonradiative occupation near the sapphire surface from optically excited 5P J states, in which atoms fail to reach the sapphire surface because of the repulsion from it. This repulsion is due to the polarization interaction between sapphire and the atoms in the 5P J states near the surface. Nonradiative transition from the 5P J state to the 6P J −1 state is accompanied by excitation of two optical phonons in sapphire.
16 lines of the principal series of Cs(6 2 s 1/2 to 7-16 2 p 3/2 and 6 2 s 1/2 to 7-12 2 p 1/2 ) were investigated in absorption. Cesium vapour density was varied from 10 13 up to 10 17 cm -3 . Red asymmetries of all lines (extended red wings) were detected. This can be understood if electron transitions in the long-range interaction region follow the selection rules of molecules. It was established that the red and the blue wings of the lines each can be fitted to lorentzian profiles in small wavelength intervals. With the help of quasistatic theory the interaction constants from the long-range interaction potential Delta omega =C 3 /r 3 multiplied by the oscillator strength were determined from measurements. For all lines the ratio of C 3 (red)/C 3 (blue) was found to equal 2 in accordance with earlier theoretical calculations. In the far line wing, deviation from a lorentzian profile occurs. This was interpreted as a consequence of electron transition in the short-range region of interatomic potentials.
We observe the propagation and the reshaping of low intensity (zero area) 60 fs pulses through high density atomic Cs vapor. The breakup of the pulses is measured for both resonant excitation of the Cs atoms and for laser detunings such that the atomic resonance frequency is in the wings of the pulse spectrum. The theory of 0π pulse propagation, in the extreme sharp-line limit, is extended to include both resonant and off resonant excitation. Good agreement is demonstrated between the observations and the theoretical predictions.