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Optical and nonradiative transitions involving triplet states of laser-active F₃⁺ colour centres in LiF crystals

T. T. Basiev, I. V. Ermakov, K. K. Pukhov

Laser Materials and Technology Research Center, Prokhorov General Physics Institute, RAS, Moscow

Abstract: Spin triplet electronic states in laser-active F₃⁺ colour centres in LiF crystals were found. The triplet — triplet spectra of the absorption from the ³E state to higher triplet states (³[IMG align=ABSMIDDLE alt=${\mathit\Gamma}$]uiop[/IMG]_α,³[IMG align=ABSMIDDLE alt=${\mathit\Gamma}$]uiop[/IMG]_β), the spectrum of the triplet — triplet ³[IMG align=ABSMIDDLE alt=${\mathit\Gamma}$]uiop[/IMG]_α → ³E fluorescence, and the spectrum of the phosphorescence accompanying the triplet — singlet intercombination ³E → ¹A₁ transition were determined. Moreover, the temperature dependences of the probabilities of nonradiative singlet — triplet (¹E → ³E) and triplet — singlet (³E → ¹A₁) transitions were determined. An analysis was made of the influence of spin triplet states on the characteristics of an LiF : F₃⁺ laser. A method was proposed for tunable lasing in a wide visible range as a result of a triplet — triplet transition in the F₃⁺ colour centres in an LiF crystal.

PACS: 78.40.Ha, 78.55.Hx, 71.55.Ht, 42.55.Rz

Received: 16.10.1996

 English version: Quantum Electronics, 1997, 27:4, 304–308

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