Spectroscopic analysis and laser parameters of Nd3+ in Ca3Sc2Ge3O12 garnet crystals |
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Authors: | E Cavalli E Zannoni A Belletti V Carozzo A Toncelli M Tonelli M Bettinelli |
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Institution: | (1) Dipartimento di Chimica Generale ed Inorganica, Chimica Analitica e Chimica Fisica – Università di Parma – Viale delle Scienze, 43100 Parma, Italy (Fax: +39-521905436), IT;(2) Istituto Nazionale di Fisica della Materia – Dipartimento di Fisica – Università di Pisa – Piazza Torricelli 2, 56126 Pisa, Italy (Fax: +39-5048277), IT;(3) Dipartimento Scientifico e Tecnologico – Università di Verona – Ca’ Vignal – Strada Le Grazie, 37134 Verona, Italy (Fax: +39-458098928), IT |
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Abstract: | 3 Sc2Ge3O12 (CaSGG) single crystals with the garnet structure have been grown by means of the flux growth technique. The doping with
Nd3+ and Mg2+ (as charge compensator) yields samples suitable for optical spectroscopy experiments. The absorption and emission properties
have been measured at temperatures ranging from 10 to 298 K. The emission spectra give evidence of the presence of non-equivalent
Nd3+ sites. The decay time of the 1.06-μm emission band has been measured as a function of temperature and incident power. The
intensities of the 298 K absorption transitions have been analyzed by means of the Judd–Ofelt theory. The radiative lifetimes,
the branching ratios (β), and the spontaneous emission probabilities have been evaluated for the 4F3/2 excited state using the calculated intensity parameters. The stimulated-emission cross sections and the branching ratios
have been estimated from the experimental data for the most important laser transitions indicating that this crystal can be
considered an interesting material for solid-state laser applications.
Received: 2 June 1998 / Revised version: 28 October 1998 / Published online: 24 February 1999 |
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Keywords: | PACS: 42 70 Hj 78 55 -m |
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