Use of lasers in the investigation of radiation-induced processes in the ionic crystals

V. M. Lisitsyn; V. I. Korepanov; V. Yu. Yakovlev

doi:10.1117/12.216916

23 August 1995 Use of lasers in the investigation of radiation-induced processes in the ionic crystals

V. M. Lisitsyn, V. I. Korepanov, V. Yu. Yakovlev

Proceedings Volume 2619, International Conference on Atomic and Molecular Pulsed Laser; (1995) https://doi.org/10.1117/12.216916
Event: Second Conference on Pulsed Lasers: Pulsed Atomic and Molecular Transitions, 1995, Tomsk, Russian Federation

Abstract

In the study of F-H pair formation in alkali halides due to excitation of the electronic subsystem, the information of short life time states of the self-trapped excitons plays an important role. In this paper we present recent achievements in such a direction obtained by using lasers. Short pulses of laser radiation are used in the measurement of transient absorption spectra obtained by band-to-band excitation and by selective optical conversion of the short-lived defects. With nanosecond luminescence spectroscopy in double-cascade excitation, we acquired data for KJ explaining the evolution (pi) ₁ and (pi) ₂ luminescence bands at different power laser pulses. We interprete these data in terms of frequent mutual transitions between 'on-' and 'off-center' equilibrium states of self-trapped excitons. The processes of energy transfer in self-trapped excitons connected with monomers of impurity ions in mixed crystal are studied. Also, impurity recombination luminescence is investigated in fractional annealing of V_k centers at 80-200 K. It is shown that luminescence intensity of heteronuclear excitons correlates with number of own but not with heteronuclear V_k centers. Impurity luminescence in these crystals occur at exciton with core of Cl₂ type conversion to heteronuclear exciton.

Citation Download Citation

V. M. Lisitsyn, V. I. Korepanov, and V. Yu. Yakovlev "Use of lasers in the investigation of radiation-induced processes in the ionic crystals", Proc. SPIE 2619, International Conference on Atomic and Molecular Pulsed Laser, (23 August 1995); https://doi.org/10.1117/12.216916

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