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Partial energy level diagram for atomic Cs, illustrating a representative three level laser system in which pumping on the transition (852.1 nm) is followed by nonradiative 6p2P3/2 → 6p2P1/2 relaxation (represented by the dashed line) and subsequent lasing at 894.3 nm ( line).
Interatomic potentials for the Cs(6s2S1/2, 6p2P3/2) + Ar system on which the photoassociation of thermalized Cs-Ar collision pairs at two wavelengths is indicated. The Cs-Ar interaction potentials are derived from Refs. 6 and 7. Continuum wavefunctions associated with a thermal () Cs-Ar colliding pair in the ground state and a dissociating CsAr complex are also given.
Laser excitation spectra recorded by monitoring the Cs 852.1 nm () laser pulse energy while tuning the excitation wavelength over the Cs-rare gas blue satellite associated with the absorption line. The lower abscissa is labeled in terms of , the energy separation between the Cs line and the pump photon energy. The Cs line lies at and the maxima in all spectra at corresponds to the blue satellite peak at . All output laser pulse energies () were normalized to the pump energy () and results are presented for several temperatures. Note that the ordinate is logarithmic.
Data illustrating that the Cs laser excitation spectrum (Fig. 3) vanishes as kT passes a threshold value: (a) Dependence of the exponential decay constant on the thermal energy kT. For (which corresponds to ), the decline of is consistent with a linear dependence on kT and a slope of −3/2. The line shown is not the least-squares fit to the data; (b) Relative area of the laser excitation spectrum over the same temperature range. Estimated uncertainties are indicated for several measurements.
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