VUV SPECTROSCOPY OF CRYSTALLINE EMITTERS BASED ON5d–4fTRANSITIONS IN RARE EARTH IONS

V. N. Makhov (), N. Yu. Kirikova, N. M. Khaidukov, M. Kirm, E. Negodin, G. Zimmerer, S. K. Lam, D. Lo, J. C. Krupa and J. Y. Gesland
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V. N. Makhov: Lebedev Physical Institute, Moscow 117924, Russia
N. Yu. Kirikova: Lebedev Physical Institute, Moscow 117924, Russia
N. M. Khaidukov: Kurnakov Institute of General and Inorganic Chemistry, Moscow 117907, Russia
M. Kirm: II. Institut für Experimentalphysik der Universität Hamburg, Hamburg 22761, Germany
E. Negodin: II. Institut für Experimentalphysik der Universität Hamburg, Hamburg 22761, Germany
G. Zimmerer: II. Institut für Experimentalphysik der Universität Hamburg, Hamburg 22761, Germany
S. K. Lam: Physics Department, Chinese University of Hong Kong, Shatin, N.T., Hong Kong SAR, China
D. Lo: Physics Department, Chinese University of Hong Kong, Shatin, N.T., Hong Kong SAR, China
J. C. Krupa: Institut de Physique Nucleaire, Orsay Cedex 91406, France
J. Y. Gesland: Université du Maine, 72017 Le Mans, France

Surface Review and Letters (SRL), 2002, vol. 09, issue 01, 621-626

Abstract: The spectroscopic properties of several fluoride crystals (LiYF4,KYF4,K2YF5,KLiYF5,CsY2F7,SrF2) doped withNd3+,Er3+orTm3+are analyzed from the viewpoint of their possible applications as active media for VUV solid state lasers. It has been found that in many crystals there exists very efficient nonradiative relaxation from higher-lying5dstates to the lowest5dlevel responsible for the spin-forbidden luminescence. In fact, the energy level diagram of5d–4ftransitions for these two ions represents a typical four-level laser scheme with a considerably larger Stokes shift of5d–4fluminescence from the edge of the strong spin-allowed4f–5dabsorption than forNd3+, which causes smaller reabsorption of emitted VUV radiation in the crystals doped withEr3+orTm3+. Two crystalsLiYF4:Nd3+andSrF2:Er3+were tested for laser action under pumping by a pulsedF2laser operating at 157 nm. However, no indications of the appearance of stimulated emission have been detected for both crystals. The possible reasons for the absence of lasing are discussed.

Date: 2002
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DOI: 10.1142/S0218625X02002919

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