Abstract
The energy level structure of F3+ laser color centers in crystals of LiF is discussed. A high-power laser (λex=920 nm) is used to excite luminescence from LiF crystals with F3+ centers via two-photon absorption, and the dependence of the polarization and intensity of this luminescence on the polarization of the laser light is measured and calculated. It is shown that the two-photon transition involves the excitation of a previously unknown state of the F3+ center—a spin singlet whose wave function has 1A1 symmetry.
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