Two-step photoionization and photophysics of color centers in LiF     crystals

Tasoltan T. Basiev; Sergey B. Mirov; Valerii V. Ter-Mikirtychev

doi:10.1117/12.131775

19 November 1992 Two-step photoionization and photophysics of color centers in LiF crystals

Tasoltan T. Basiev, Sergey B. Mirov, Valerii V. Ter-Mikirtychev

Proceedings Volume 1839, Solid State Lasers and New Laser Materials; (1992) https://doi.org/10.1117/12.131775
Event: XIV International Conference on Coherent and Nonlinear Optics, 1991, St. Petersburg, Russian Federation

Abstract

The results are presented of theoretical and experimental studies of two-step photoionization and photochemistry of color centers in LiF crystals. The exact analytic expressions were obtained for the population of optic centers energy levels in the process of two-step photoionization within a framework of kinetic equations in three-level approximation. A transfer from cw to pulsed-periodic excitation was analyzed. An analytic dependence was obtained of the ionization cross-section on the incident light flux intensity. For the first time the cross-section was estimated of the photoionization from the excited level of F₂ color center in LiF crystal being pumped by 532 nm wavelength radiation. The processes were detected of mutual phototransformations of F₃, F₃⁺ and N color centers in oxygen-free LiF crystals. It was demonstrated that the presence of F₃ and F₃⁺ color centers in crystals is necessary for selective accumulation of N color centers at high temperature (300 K) action of Nd:YAG laser third harmonic radiation. In LiF- OH crystals the processes of mutual phototransformations were detected in a CC ensemble with absorption bands maxima at wavelengths 380 nm, 450 nm, and within the range 500 - 570 nm. It was demonstrated that an effective destruction of the CC absorption band (380 nm) along with the formation of absorption bands with maxima within 500 - 570 nm takes place under high-temperature (300 K) action of Nd:YAG laser third harmonic radiation ((lambda) equals 354 nm). Reverse phototransformation with the recovery of the band at 380 nm takes place along with the known phototransformation F₂ (450 nm) yields F₂⁺ (654 nm) under the subsequent action of the same laser second harmonic radiation ((lambda) equals 532 nm).

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Tasoltan T. Basiev, Sergey B. Mirov, and Valerii V. Ter-Mikirtychev "Two-step photoionization and photophysics of color centers in LiF crystals", Proc. SPIE 1839, Solid State Lasers and New Laser Materials, (19 November 1992); https://doi.org/10.1117/12.131775

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